chore(workflows): add release workflow and merge template

- Add a default merge message template for pull requests
- Introduce a release workflow to automate changelog generation
  and publishing

.gitea/default_merge_message/MERGE_TEMPLATE.md

@@ -0,0 +1,5 @@
+chore(pr): ${PullRequestTitle} ${PullRequestReference}
+
+${PullRequestDescription}
+
+Merged from ${HeadBranch} into ${BaseBranch}

.gitea/workflows/release.yml

@@ -0,0 +1,19 @@
+name: Auto Changelog & Release
+
+on:
+  push:
+    branches:
+      - main
+      - "**"
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Release
+        uses: https://git.0xmax42.io/actions/auto-changelog-release-action@v0
+        with:
+          token: ${{ secrets.RELEASE_PUBLISH_TOKEN }}