fix: replace Gitea services container with manual docker run for Qdrant

The Gitea Actions runner v1.0.8 fails to start the Qdrant service container
with 'exec: ./entrypoint.sh: no such file or directory'. This is a runner bug
with how it handles service container entrypoints/CMD.

Bypass the service container mechanism by starting Qdrant manually with
docker run -d and a health check wait loop.

.gitea/workflows/docker-build.yaml

@@ -1 +1,88 @@
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+name: Docker Build and Push
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
+      - uses: actions/setup-python@v6
+        with:
+          python-version: "3.13"
+      - name: Install dependencies
+        run: |
+          pip install -r requirements.txt pytest
+      - name: Run unit tests
+        run: pytest tests/ -v --ignore=tests/test_integration.py
+
+  integration-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
+
+      - name: Start Qdrant
+        run: |
+          docker run -d --name qdrant \
+            -p 6333:6333 -p 6334:6334 \
+            docker.io/qdrant/qdrant:latest
+
+      - name: Wait for Qdrant
+        run: |
+          for i in $(seq 1 30); do
+            curl -s http://localhost:6333/healthz && echo "QDRANT ready" && break
+            echo "Waiting for Qdrant... ($i/30)"
+            sleep 1
+          done
+
+      - uses: actions/setup-python@v6
+        with:
+          python-version: "3.13"
+      - name: Install dependencies
+        run: |
+          pip install -r requirements.txt pytest
+      - name: Run integration tests
+        run: pytest tests/test_integration.py -v
+        env:
+          QDRANT_URL: http://localhost:6333
+          COLLECTION_NAME: test_mcp_maildir
+
+  build:
+    runs-on: ubuntu-latest
+    needs: [test, integration-test]
+    steps:
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@d7f5e7f509e45cec5c76c4d5afdd7de93d0b3df5 # v4
+
+      - name: Login to Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@650006c6eb7dba73a995cc03b0b2d7f5ca915bee # v4
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Docker metadata
+        id: meta
+        uses: docker/metadata-action@80c7e94dd9b9319bd5eb7a0e0fe9291e23a2a2e9 # v6
+        with:
+          images: jcabillot/mcp-maildir
+          tags: |
+            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}
+
+      - name: Build and push
+        uses: docker/build-push-action@f9f3042f7e2789586610d6e8b85c8f03e5195baf # v7
+        with:
+          context: .
+          file: pkg/Dockerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          pull: true