ci: auto-bump version on merge to main (v0.1.0-alpha)

.github/workflows/release.yml

@@ -0,0 +1,73 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '.github/workflows/**'
+
+permissions:
+  contents: write
+
+concurrency:
+  group: release
+  cancel-in-progress: false
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Bump version and push tag
+        id: bump
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -euo pipefail
+          git fetch --tags --force
+
+          if git describe --tags --exact-match HEAD >/dev/null 2>&1; then
+            echo "HEAD is already tagged, skipping bump"
+            exit 0
+          fi
+
+          latest=$(git tag --sort=-v:refname --list 'v*.*.*-alpha' | head -n 1)
+          if [ -z "$latest" ]; then
+            echo "::error::No tag matching vX.Y.Z-alpha pattern found"
+            exit 1
+          fi
+          echo "Latest tag: $latest"
+
+          version="${latest#v}"
+          version="${version%-alpha}"
+          IFS='.' read -r major minor patch <<< "$version"
+          new_version="${major}.${minor}.$((patch + 1))-alpha"
+          new_tag="v${new_version}"
+
+          if git rev-parse "$new_tag" >/dev/null 2>&1; then
+            echo "::error::Tag $new_tag already exists"
+            exit 1
+          fi
+
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git tag -a "$new_tag" -m "Release $new_tag"
+          git push origin "$new_tag"
+
+          echo "tag=$new_tag" >> "$GITHUB_OUTPUT"
+
+      - name: Create GitHub release
+        if: steps.bump.outputs.tag
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ steps.bump.outputs.tag }}
+          name: ${{ steps.bump.outputs.tag }}
+          prerelease: true
+          generate_release_notes: true