ci: auto-create GitHub release on tag push

Author: rompik

.github/workflows/release-on-tag.yml

@@ -0,0 +1,87 @@
+name: Create GitHub Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Tag to release (for example: v0.8.5)"
+        required: true
+        type: string
+
+permissions:
+  contents: write
+
+concurrency:
+  group: release-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  create-release:
+    runs-on: ubuntu-latest
+    env:
+      FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
+    steps:
+    - uses: actions/checkout@v5
+      with:
+        fetch-depth: 0
+
+    - name: Resolve tag and version
+      id: meta
+      shell: bash
+      run: |
+        if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
+          TAG_NAME="${{ inputs.tag }}"
+        else
+          TAG_NAME="${GITHUB_REF_NAME}"
+        fi
+
+        if [ -z "$TAG_NAME" ]; then
+          echo "Tag name is empty"
+          exit 1
+        fi
+
+        VERSION="${TAG_NAME#v}"
+        echo "tag=$TAG_NAME" >> "$GITHUB_OUTPUT"
+        echo "version=$VERSION" >> "$GITHUB_OUTPUT"
+
+    - name: Extract release notes from changelog
+      id: notes
+      shell: bash
+      run: |
+        VERSION="${{ steps.meta.outputs.version }}"
+
+        awk -v ver="$VERSION" '
+          index($0, "## " ver) == 1 { in_section = 1; next }
+          in_section && /^## / { exit }
+          in_section { print }
+        ' CHANGELOG.md > RELEASE_NOTES.md
+
+        if grep -q '[^[:space:]]' RELEASE_NOTES.md; then
+          echo "has_notes=true" >> "$GITHUB_OUTPUT"
+        else
+          echo "No changelog section for version $VERSION, fallback to autogenerated notes"
+          echo "has_notes=false" >> "$GITHUB_OUTPUT"
+        fi
+
+    - name: Create release from changelog notes
+      if: steps.notes.outputs.has_notes == 'true'
+      uses: softprops/action-gh-release@v2
+      with:
+        tag_name: ${{ steps.meta.outputs.tag }}
+        name: OpenIso ${{ steps.meta.outputs.version }}
+        body_path: RELEASE_NOTES.md
+        draft: false
+        prerelease: false
+
+    - name: Create release with autogenerated notes
+      if: steps.notes.outputs.has_notes != 'true'
+      uses: softprops/action-gh-release@v2
+      with:
+        tag_name: ${{ steps.meta.outputs.tag }}
+        name: OpenIso ${{ steps.meta.outputs.version }}
+        generate_release_notes: true
+        draft: false
+        prerelease: false