Add release automation

Signed-off-by: Nikola Forró <[email protected]>

.github/workflows/do-release.yml

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+name: Create a GitHub release once a release PR is merged
+
+on:
+  workflow_dispatch:
+  pull_request:
+    types:
+      - closed
+
+jobs:
+  if_merged:
+    if: github.event.pull_request.merged == true && contains(github.event.pull_request.labels.*.name, 'release') && github.repository_owner == 'packit'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Create GitHub release
+        run: |
+          VERSION=$(grep -oP '^# \K[0-9.]+([.\-_]?[a-zA-Z0-9.\-_]+)?' CHANGELOG.md | head -n 1)
+          # Take the lines between the first two headers from CHANGELOG.md,
+          # and use it as a description for the new release.
+          CHANGELOG=$(awk 'BEGIN { first = 0 } /^# / { if (first == 0) { first = 1 } else { exit } } /^[^#]/ { print $0 }' CHANGELOG.md)
+          # Use the changelog re-calculated to create a new release
+          gh release create ${VERSION} --draft --title ${VERSION} -n "${CHANGELOG}"
+        env:
+          GH_TOKEN: ${{ secrets.RELEASEBOT_GITHUB_TOKEN }}

.github/workflows/prepare-release.yml

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+name: Prepare a new release
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        required: true
+        description: Version number for the new release
+
+jobs:
+  prepare-release:
+    # To not run in forks
+    if: github.repository_owner == 'packit'
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Prepare release content
+        uses: packit/prepare-release@v3
+        with:
+          version: ${{ inputs.version }}
+          specfiles:
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v4
+        with:
+          labels: release
+          commit-message: Release ${{ inputs.version }}
+          title: Release ${{ inputs.version }}
+          body: Update the changelog for release ${{ inputs.version }}.
+          delete-branch: true