Add action

Former-commit-id: 30c4e6a69c339ed456c912f56af6a05f8090d357

.github/workflows/main.yml

@@ -0,0 +1,38 @@
+name: Publish Docker image
+
+on:
+  push:
+    branches: master
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    steps:
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: milesial
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: milesial/unet
+
+      - name: Build and push Docker image
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}