Add GitHub Actions workflow for releasing Docker image

Author: aniongithub

.github/workflows/release.yml

@@ -0,0 +1,49 @@
+name: Release Docker Image
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+      
+    - name: Log in to Docker Hub
+      uses: docker/login-action@v3
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+        
+    - name: Extract release version
+      id: version
+      run: |
+        echo "version=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+        
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v5
+      with:
+        context: .
+        file: ./Dockerfile
+        push: true
+        tags: |
+          ${{ secrets.DOCKER_USERNAME }}/memoryalpha-rag-api:latest
+          ${{ secrets.DOCKER_USERNAME }}/memoryalpha-rag-api:${{ steps.version.outputs.version }}
+        platforms: linux/amd64,linux/arm64
+        cache-from: type=gha
+        cache-to: type=gha,mode=max
+        
+    - name: Update Docker Hub description
+      uses: peter-evans/dockerhub-description@v3
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+        repository: ${{ secrets.DOCKER_USERNAME }}/memoryalpha-rag-api
+        short-description: "REST API for RAG over Star Trek MemoryAlpha database using Ollama"
+        readme-filepath: ./README.md