Add CLAUDE.md with project guidance and update CI workflow for improved coverage and Docker build

.gitea/workflows/ci.yml

@@ -16,12 +16,45 @@ jobs:
           go-version: '1.26'
       - name: Run tests with coverage
         run: |
-          go test -v -coverprofile=coverage.out ./...
+          go test -v -coverprofile=coverage.out -coverpkg=./... ./...
           go tool cover -func=coverage.out | tee coverage.txt
           cov=$(go tool cover -func=coverage.out | grep total: | awk '{print substr($3, 1, length($3)-1)}')
           cov=${cov%.*}
           if [ "$cov" -lt 80 ]; then
             echo "::warning::Test coverage is below 80% ($cov%)"
           fi
-      - name: Build Docker image
-        run: docker build -t diun-webhook-dashboard .
+      - name: Build binary
+        run: go build ./...
+
+  docker:
+    runs-on: dind
+    needs: build-test
+    if: gitea.event_name == 'push'
+    container:
+      image: docker:cli
+    services:
+      dind:
+        image: docker:dind
+        options: --privileged
+        env:
+          DOCKER_TLS_CERTDIR: ""
+    env:
+      DOCKER_HOST: tcp://dind:2375
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+      - name: Log in to Gitea registry
+        run: |
+          REGISTRY="${{ gitea.server_url }}"
+          REGISTRY="${REGISTRY#https://}"
+          REGISTRY="${REGISTRY#http://}"
+          echo "${{ secrets.GITEA_TOKEN }}" | docker login "$REGISTRY" -u "${{ gitea.actor }}" --password-stdin
+      - name: Build and push
+        run: |
+          REGISTRY="${{ gitea.server_url }}"
+          REGISTRY="${REGISTRY#https://}"
+          REGISTRY="${REGISTRY#http://}"
+          IMAGE="$REGISTRY/${{ gitea.repository }}"
+          docker build -t "$IMAGE:${{ gitea.sha }}" -t "$IMAGE:latest" .
+          docker push "$IMAGE:${{ gitea.sha }}"
+          docker push "$IMAGE:latest"