ci(gitea): add validation and release workflows

.gitea/workflows/pr-merge-validation.yml

@@ -0,0 +1,27 @@
+name: Pull Request Merge Validation
+
+on:
+  pull_request_target:
+    types:
+      - closed
+
+jobs:
+  validate-merged-pr:
+    if: ${{ github.event.pull_request.merged == true }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout merged commit
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.merge_commit_sha }}
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Run full unit test suite
+        run: go test ./...
+
+      - name: Run behavior suite
+        run: ./script/run-behavior-suite-docker.sh