Add Docker support with build and push workflow, and configure Gunicorn for application serving

.forgejo/workflows/docker.yaml

@@ -0,0 +1,29 @@
+name: Build and push Docker image
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          registry: code.edgarpierre.fr
+          username: ${{ vars.DOCKER_PUSH_USERNAME }}
+          password: ${{ secrets.DOCKER_PUSH_PASSWORD }}
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      -
+        name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: |
+            code.edgarpierre.fr/${{ github.repository }}:${{ github.ref_name }}
+            code.edgarpierre.fr/${{ github.repository }}:latest