Add workflow for automatic release

Author: msk

.github/workflows/release.yml

@@ -0,0 +1,62 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - '[0-9]+.[0-9]+.[0-9]+'  # Matches x.y.z version tags
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Extract version from tag
+        id: version
+        run: echo "version=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+
+      - name: Extract release notes from CHANGELOG.md
+        id: release_notes
+        run: |
+          # Find the section for this version in CHANGELOG.md
+          VERSION="${{ steps.version.outputs.version }}"
+          # Look for the version heading (## [x.y.z] or ## x.y.z)
+          SECTION_START=$(grep -n "^## \[$VERSION\]\|^## $VERSION" CHANGELOG.md | head -1 | cut -d: -f1)
+
+          if [ -z "$SECTION_START" ]; then
+            echo "Could not find version $VERSION in CHANGELOG.md"
+            echo "release_notes=Release for version $VERSION" >> $GITHUB_OUTPUT
+          else
+            # Find the next version section or end of file
+            NEXT_SECTION=$(tail -n +$((SECTION_START + 1)) CHANGELOG.md | grep -n "^## " | head -1 | cut -d: -f1)
+
+            if [ -z "$NEXT_SECTION" ]; then
+              # No next section, read to end of file, but skip the first line (version header)
+              # Write directly to temp file to avoid shell interpretation of backticks
+              tail -n +$((SECTION_START + 1)) CHANGELOG.md > /tmp/release_notes_temp.txt
+            else
+              # Read until next section, but skip the first line (version header)
+              # Write directly to temp file to avoid shell interpretation of backticks
+              tail -n +$((SECTION_START + 1)) CHANGELOG.md | head -n $((NEXT_SECTION - 2)) > /tmp/release_notes_temp.txt
+            fi
+
+            # Clean up the notes (remove empty lines at start/end) directly in the file
+            sed -i '/^$/d' /tmp/release_notes_temp.txt
+            sed -i -e :a -e '/^\n*$/{$d;N;ba' -e '}' /tmp/release_notes_temp.txt
+
+            # Use base64 encoding to safely pass the content through GitHub Actions
+            RELEASE_NOTES_B64=$(base64 -w 0 < /tmp/release_notes_temp.txt)
+            echo "release_notes_b64=$RELEASE_NOTES_B64" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Create Release
+        run: |
+          # Decode the base64-encoded release notes
+          echo "${{ steps.release_notes.outputs.release_notes_b64 }}" | base64 -d > release_notes.txt
+          gh release create ${{ steps.version.outputs.version }} \
+            --title "${{ steps.version.outputs.version }}" \
+            --notes-file release_notes.txt \
+            --repo ${{ github.repository }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}