add workflow to check the content of the archive

.ci/github/archive_allow.txt

@@ -0,0 +1,7 @@
+lib/
+CHANGELOG.md
+COPYRIGHT
+LICENSE
+README.md
+UPGRADE_TO_1_2
+composer.json

.ci/github/files_between_commits.sh

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+#!/bin/sh
+
+branch=$1
+hash=$2
+
+git fetch origin
+
+# root folder of added files
+git diff --color --name-only --diff-filter=A ${branch}..${hash} | cut -d/ -f1 || exit 1
+
+# list changed root files
+git diff --name-only ${branch}..${hash} | grep '/' -v || exit 1
+
+# the previous command lists the changed files as their new name, so we list the original names too
+git diff ${branch}..${hash} | grep '^rename from' | sed 's/^rename from //' | cut -d/ -f1 || exit 1

.ci/github/number_of_files_changed_in_root.sh

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+#!/bin/sh
+
+cat - | sort | uniq | wc -l

.ci/github/validate_archive.sh

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+#!/bin/sh
+
+archive_name=$1
+pattern_file=$(dirname $0)/archive_allow.txt
+
+if [ ! -f "$pattern_file" ]
+then
+  echo "config file not exists: $pattern_file"
+  exit 1
+fi
+
+# test for empty
+
+archive_content=$(tar -tf $archive_name)
+
+for pattern in $(cat $pattern_file)
+do
+  archive_content=$(echo "$archive_content" | grep -v "^$pattern")
+done
+
+if [ $(echo "$archive_content" | grep ^$ -v | wc -l) -gt 0 ]
+then
+  echo "Files not allowed in archive:"
+  echo "$archive_content"
+  exit 1
+fi

.github/workflows/archive-validation.yml

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+name: Git Archive Content Check
+
+on:
+  pull_request:
+    branches:
+      - master
+    paths:
+      - .github/workflows/archive-validation.yml
+      - .ci/github/archive_allow.txt
+      - ./*
+  push:
+    branches:
+      - master
+    paths:
+      - .github/workflows/archive-validation.yml
+      - .ci/github/archive_allow.txt
+      - ./*
+
+jobs:
+  archive-validation:
+    name: Git Archive Content Check
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - id: number-of-changed-files
+        run: |
+          echo "NO_OF_FILES_CHANGED_IN_ROOT=$(.ci/github/files_between_commits.sh origin/$GITHUB_BASE_REF $GITHUB_SHA | .ci/github/number_of_files_changed_in_root.sh)" >> $GITHUB_ENV
+
+      - run: |
+          git archive -o archive.tar $GITHUB_SHA && sh .ci/github/validate_archive.sh archive.tar
+         if: ${{ steps.number-of-changed-files.outputs.no_of_changed_files_in_root > 0 }}
+