build docker image in workflow

.github/workflows/build.yml

@@ -18,12 +18,31 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-
-    - name: Set up Go
-      uses: actions/setup-go@v2
-      with:
-        go-version: 1.17
-
-    - name: Build
-      run: make build
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Login to DockerHub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1 
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Docker metadata for Tracetest
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: kubeshop/tracetest
+          tags: |
+            type=match,pattern=v(.*)
+            type=sha
+          flavor: |
+            latest=true
+      - name: Build and push Tracetest
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: Dockerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}