Add workflow

Author: Vinlic

.github/workflows/docker-image.yml

@@ -0,0 +1,46 @@
+name: Build and Push Docker Image
+
+on:
+  release:
+    types: [created]
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Tag Name'
+        required: true
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+
+    - name: Login to Docker Hub
+      uses: docker/login-action@v1
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+    - name: Set tag name
+      id: tag_name
+      run: |
+        if [ "${{ github.event_name }}" = "release" ]; then
+          echo "::set-output name=tag::${GITHUB_REF#refs/tags/}"
+        elif [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
+          echo "::set-output name=tag::${{ github.event.inputs.tag }}"
+        fi
+
+    - name: Build and push Docker image with Release tag
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        file: ./Dockerfile
+        push: true
+        tags: |
+          vinlic/emohaa-free-api:${{ steps.tag_name.outputs.tag }}
+          vinlic/emohaa-free-api:latest
+        platforms: linux/amd64,linux/arm64
+        build-args: TARGETPLATFORM=${{ matrix.platform }}