Add github actions

Signed-off-by: Daniel Henry <iamdanhenry@gmail.com>

.github/workflows/build-publish.yaml

@@ -0,0 +1,38 @@
+name: Build and Publish Docker Image
+
+on:
+  push:
+    branches:
+      - main  # Trigger on pushes to main
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest  # Ensure your Gitea runner has this label
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      # Login to your registry (Docker Hub, Gitea Package Registry, or Harbor)
+      - name: Login to Docker Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ secrets.DOCKER_REGISTRY }} # Remove if using Docker Hub
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: Dockerfile
+          push: true
+          # Tags the image as 'latest' and also uses the git SHA for versioning
+          tags: |
+            ${{ secrets.DOCKER_REGISTRY }}/${{ secrets.DOCKER_USERNAME }}/email-classifier:latest
+            ${{ secrets.DOCKER_REGISTRY }}/${{ secrets.DOCKER_USERNAME }}/email-classifier:${{ gitea.sha }}
+          # Caching speeds up builds by reusing layers (crucial for 'uv' installs)
+          cache-from: type=gha
+          cache-to: type=gha,mode=max