diff --git a/.github/actions/check-go-license-boilerplate/action.yaml b/.github/actions/check-go-license-boilerplate/action.yaml
new file mode 100644
index 0000000..8b16f92
--- /dev/null
+++ b/.github/actions/check-go-license-boilerplate/action.yaml
@@ -0,0 +1,42 @@
+name: Check Go license boilerplate
+description: Check license boilerplate used in Go files
+inputs:
+  boilerplate-path:
+    description: License boilerplate file path
+    required: true
+  boilerplate-content:
+    description: License boilerplate content
+    default: |-
+      /*
+      SPDX-FileCopyrightText: ${YEAR} SAP SE or an SAP affiliate company and ${REPOSITORY} contributors
+      SPDX-License-Identifier: Apache-2.0
+      */
+runs:
+  using: composite
+  steps:
+  - name: Check boilerplate file
+    shell: bash
+    env:
+      INPUT_BOILERPLATE_PATH: ${{ inputs.boilerplate-path }}
+      INPUT_BOILERPLATE_CONTENT: ${{ inputs.boilerplate-content }}
+    run: |
+      this_year=$(date +%Y)
+      last_year=$((this_year-1))
+      repository=$(echo $GITHUB_REPOSITORY | cut -d/ -f2)
+
+      tempdir=$(mktemp -d)
+      trap 'rm -rf $tempdir' EXIT
+
+      printenv INPUT_BOILERPLATE_CONTENT | YEAR=$this_year REPOSITORY=$repository envsubst > $tempdir/boilerplate-this-year
+      printenv INPUT_BOILERPLATE_CONTENT | YEAR=$last_year REPOSITORY=$repository envsubst > $tempdir/boilerplate-last-year
+
+      if diff -q $INPUT_BOILERPLATE_PATH $tempdir/boilerplate-this-year >/dev/null; then
+        exit 0
+      fi
+      if diff -q $INPUT_BOILERPLATE_PATH $tempdir/boilerplate-last-year >/dev/null; then
+        >&1 echo "Warning: license boilerplate outdated ($last_year); next year, this will result in an error."
+        exit 0
+      fi
+
+      >&1 echo "Error: incorrect license boilerplate."
+      exit 1
diff --git a/.github/actions/check-go-license-headers/action.yaml b/.github/actions/check-go-license-headers/action.yaml
new file mode 100644
index 0000000..6d8db51
--- /dev/null
+++ b/.github/actions/check-go-license-headers/action.yaml
@@ -0,0 +1,45 @@
+name: Check Go license headers
+description: Check license headers of Go files
+inputs:
+  base-path:
+    description: Base directory
+    default: .
+  boilerplate-path:
+    description: License header file path
+    required: true
+runs:
+  using: composite
+  steps:
+  - name: Check files
+    shell: ruby {0}
+    env:
+      INPUT_BASE_PATH: ${{ inputs.base-path }}
+      INPUT_BOILERPLATE_PATH: ${{ inputs.boilerplate-path }}
+    run: |
+      base_path = ENV["INPUT_BASE_PATH"]
+      raise "Input parameter base-path must not start with slash" if base_path.start_with?("/")
+      raise "Input parameter base-path must not be empty" if base_path.empty?
+      raise "Specified base-path does not exist: #{base_path}" if !Dir.exists?(base_path)
+
+      boilerplate_path = ENV["INPUT_BOILERPLATE_PATH"]
+      raise "Input parameter boilerplate-path must not start with slash" if boilerplate_path.start_with?("/")
+      raise "Input parameter boilerplate-path must not be empty" if boilerplate_path.empty?
+
+      boilerplate = File.readlines(boilerplate_path)
+      errors = 0
+
+      Dir.glob("**/*.go").each do |p|
+        file = File.readlines(p)
+        file.each_with_index do |line,i|
+          next if line =~ /^\/\/go:build/
+          next if line =~ /^\/\/\s*\+build/
+          next if line =~ /^\s*$/
+          if file[i,boilerplate.size] != boilerplate then
+            STDERR.puts "#{p}: bad or missing license header"
+            errors += 1
+          end
+          break
+        end
+      end
+
+      exit 1 if errors > 0
\ No newline at end of file
diff --git a/.github/actions/get-highest-tag/action.yaml b/.github/actions/get-highest-tag/action.yaml
index 20147c4..bc526ad 100644
--- a/.github/actions/get-highest-tag/action.yaml
+++ b/.github/actions/get-highest-tag/action.yaml
@@ -3,6 +3,7 @@ description: Get highest semver tag in current repository
 inputs:
   prefix:
     description: Tag prefix (only tags with that prefix are considered)
+    default: ''
 outputs:
   tag:
     description: Highest tag (according to semver ordering)
diff --git a/.github/actions/setup-helm-docs/action.yaml b/.github/actions/setup-helm-docs/action.yaml
index 1c00296..1d17601 100644
--- a/.github/actions/setup-helm-docs/action.yaml
+++ b/.github/actions/setup-helm-docs/action.yaml
@@ -3,55 +3,53 @@ description: Setup helm-docs
 inputs:
   version:
     description: Version
-    required: true
     default: latest
   install-directory:
     description: Target installation directory
-    required: false
     default: '$HOME/.helm-docs/bin'
 outputs:
   path:
     description: Path to the installed helm-docs executable
     value: ${{ steps.install.outputs.path }}
 runs:
-  using: "composite"
+  using: composite
   steps:
-    - name: Install helm-docs
-      id: install
-      shell: bash
-      run: |
-        version=${{ inputs.version}}
-        install_directory=${{ inputs.install-directory }}
-        if [ "$version" == latest ]; then
-          version=$(curl -sSf https://api.github.com/repos/norwoodj/helm-docs/releases/latest | jq -r .tag_name)
-        fi
-        version=${version/#v/}
-        case $(uname -s) in
-          Linux)
-            os=Linux
-            ;;
-          *)
-            >&1 echo "Unsupported OS: $(uname -s)"
-            exit 1
-            ;;
-        esac
-        case $(uname -m) in
-          arm64|aarch64)
-            arch=arm64
-            ;;
-          x86_64|amd64)
-            arch=x86_64
-            ;;
-          *)
-            >&1 echo "§Unsupported architecture: $(uname -m)"
-            exit 1
-            ;;
-        esac
-        mkdir -p "$install_directory"
-        temp_directory=$(mktemp -d)
-        trap 'rm -rf $temp_directory' EXIT
-        curl -sSfL https://github.com/norwoodj/helm-docs/releases/download/v${version}/helm-docs_${version}_${os}_${arch}.tar.gz | tar xz -C $temp_directory
-        cp -f $temp_directory/helm-docs $install_directory
-        chmod a+x "$install_directory/helm-docs"
-        echo "$install_directory" >> $GITHUB_PATH
-        echo "path=$install_directory/helm-docs" >> $GITHUB_OUTPUT
\ No newline at end of file
+  - name: Install helm-docs
+    id: install
+    shell: bash
+    run: |
+      version=${{ inputs.version}}
+      install_directory=${{ inputs.install-directory }}
+      if [ "$version" == latest ]; then
+        version=$(curl -sSf https://api.github.com/repos/norwoodj/helm-docs/releases/latest | jq -r .tag_name)
+      fi
+      version=${version/#v/}
+      case $(uname -s) in
+        Linux)
+          os=Linux
+          ;;
+        *)
+          >&1 echo "Unsupported OS: $(uname -s)"
+          exit 1
+          ;;
+      esac
+      case $(uname -m) in
+        arm64|aarch64)
+          arch=arm64
+          ;;
+        x86_64|amd64)
+          arch=x86_64
+          ;;
+        *)
+          >&1 echo "§Unsupported architecture: $(uname -m)"
+          exit 1
+          ;;
+      esac
+      mkdir -p "$install_directory"
+      temp_directory=$(mktemp -d)
+      trap 'rm -rf $temp_directory' EXIT
+      curl -sSfL https://github.com/norwoodj/helm-docs/releases/download/v${version}/helm-docs_${version}_${os}_${arch}.tar.gz | tar xz -C $temp_directory
+      cp -f $temp_directory/helm-docs $install_directory
+      chmod a+x "$install_directory/helm-docs"
+      echo "$install_directory" >> $GITHUB_PATH
+      echo "path=$install_directory/helm-docs" >> $GITHUB_OUTPUT
\ No newline at end of file
diff --git a/.github/actions/setup-semver/action.yaml b/.github/actions/setup-semver/action.yaml
index 129d769..8daae9a 100644
--- a/.github/actions/setup-semver/action.yaml
+++ b/.github/actions/setup-semver/action.yaml
@@ -3,30 +3,28 @@ description: Setup semver
 inputs:
   version: 
     description: Version
-    required: true
     default: latest
   install-directory:
     description: Target installation directory
-    required: false
     default: '$HOME/.semver/bin'
 outputs:
   path:
     description: Path to the installed semver executable
     value: ${{ steps.install.outputs.path }}
 runs:
-  using: "composite"
+  using: composite
   steps:
-    - name: Install semver
-      id: install
-      shell: bash
-      run: |
-        version=${{ inputs.version}}
-        install_directory=${{ inputs.install-directory }}
-        if [ "$version" == latest ]; then
-          version=master
-        fi
-        mkdir -p "$install_directory"
-        curl -sSf -L -o "$install_directory/semver" https://raw.githubusercontent.com/fsaintjacques/semver-tool/$version/src/semver
-        chmod a+x "$install_directory/semver"
-        echo "$install_directory" >> $GITHUB_PATH
-        echo "path=$install_directory/semver" >> $GITHUB_OUTPUT
\ No newline at end of file
+  - name: Install semver
+    id: install
+    shell: bash
+    run: |
+      version=${{ inputs.version}}
+      install_directory=${{ inputs.install-directory }}
+      if [ "$version" == latest ]; then
+        version=master
+      fi
+      mkdir -p "$install_directory"
+      curl -sSf -L -o "$install_directory/semver" https://raw.githubusercontent.com/fsaintjacques/semver-tool/$version/src/semver
+      chmod a+x "$install_directory/semver"
+      echo "$install_directory" >> $GITHUB_PATH
+      echo "path=$install_directory/semver" >> $GITHUB_OUTPUT
\ No newline at end of file