ci: add Gitea workflow to automate releases on PR merge

.gitea/workflows/release.yaml

@@ -0,0 +1,47 @@
+name: Release on Merge
+
+on:
+  pull_request:
+    types: [closed]
+    branches:
+      - main
+
+jobs:
+  release:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set Tag Name
+        id: tag
+        run: echo "tag=v$(date +'%Y.%m.%d-%H%M')" >> $GITHUB_OUTPUT
+
+      - name: Generate Changelog
+        id: changelog
+        run: |
+          echo "CHANGELOG<<EOF" >> $GITHUB_OUTPUT
+          git log --pretty=format:"- %s (%h)" ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }} >> $GITHUB_OUTPUT
+          echo "" >> $GITHUB_OUTPUT
+          echo "EOF" >> $GITHUB_OUTPUT
+
+      - name: Create Release and Upload Asset
+        uses: softprops/action-gh-release@v1
+        with:
+          tag_name: ${{ steps.tag.outputs.tag }}
+          name: "Release: ${{ github.event.pull_request.title }}"
+          body: |
+            ## Summary
+            ${{ github.event.pull_request.body }}
+
+            ## Changelog
+            ${{ steps.changelog.outputs.CHANGELOG }}
+          files: |
+            color-tool
+          draft: false
+          prerelease: false
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}