ci: add Gitea Actions workflow (.gitea/workflows/ci.yml)

- Build + test on push/PR
- Release pipeline on release/* tags
- Failure issue creation via Gitea API

.gitea/workflows/ci.yml

@@ -0,0 +1,76 @@
+name: Action Gateway CI/CD
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  push:
+    tags:
+      - 'release/*'
+
+jobs:
+  build-and-test:
+    name: Build & Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          toolchain: stable
+
+      - name: Build
+        run: cargo build --release
+
+      - name: Run tests
+        run: cargo test
+
+      - name: Check formatting
+        run: cargo fmt --check
+
+      - name: Clippy
+        run: cargo clippy -- -D warnings
+
+  release:
+    name: Publish Release
+    runs-on: ubuntu-latest
+    needs: build-and-test
+    if: startsWith(github.ref, 'refs/tags/release/')
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          toolchain: stable
+
+      - name: Build release binary
+        run: cargo build --release
+
+      - name: Extract tag
+        id: tag
+        run: echo "TAG=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+
+      - name: Create Gitea release with binary
+        run: |
+          RELEASE=$(curl -s -X POST "$GITEA_URL/api/v1/repos/$GITEA_OWNER/$GITEA_REPO/releases" \
+            -H "Authorization: token $GITEA_TOKEN" \
+            -H "Content-Type: application/json" \
+            -d "{
+              \"tag_name\": \"${{ steps.tag.outputs.TAG }}\",
+              \"name\": \"Action Gateway ${{ steps.tag.outputs.TAG }}\",
+              \"body\": \"Automated release\\n\\nCommit: ${{ github.sha }}\",
+              \"draft\": false
+            }")
+          RELEASE_ID=$(echo $RELEASE | python3 -c "import sys,json; print(json.load(sys.stdin)['id'])")
+
+          curl -s -X POST "$GITEA_URL/api/v1/repos/$GITEA_OWNER/$GITEA_REPO/releases/$RELEASE_ID/assets" \
+            -H "Authorization: token $GITEA_TOKEN" \
+            -F "attachment=@target/release/action-gateway;filename=action-gateway-linux-amd64"
+        env:
+          GITEA_URL: https://git.dominat.us
+          GITEA_OWNER: clawbot
+          GITEA_REPO: action-gateway
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}