Merge pull request #16 from up9inc/feature/try_guthub_action

Add github action to push new image to gcr

.github/workflows/main.yml

@@ -0,0 +1,38 @@
+name: ci
+on:
+  push:
+    branches:
+      - 'develop'
+      - 'main'
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Get base image name
+        shell: bash
+        run: echo "##[set-output name=image;]$(echo gcr.io/up9-docker-hub/mizu/${GITHUB_REF#refs/heads/})"
+        id: base_image_step
+      - name: Docker meta
+        id: meta
+        uses: crazy-max/ghaction-docker-meta@v2
+        with:
+          images: ${{ steps.base_image_step.outputs.image }}
+          tags: |
+            type=sha
+            type=raw,${{ github.sha }}
+            type=raw,latest
+      - name: Login to DockerHub  
+        uses: docker/login-action@v1 
+        with:
+          registry: gcr.io
+          username: _json_key
+          password: ${{ secrets.GCR_JSON_KEY }}
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}