add latest tag pushing

Author: Adven27

.github/workflows/main.yml

@@ -9,10 +9,17 @@ jobs:
     steps:
       - name: Check out the repo
         uses: actions/checkout@v2
-      - name: Push to Docker Hub
+      - name: Push tag
         uses: docker/build-push-action@v1
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
           repository: adven27/grpc-wiremock
           tag_with_ref: true
+      - name: Push latest
+        uses: docker/build-push-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          repository: adven27/grpc-wiremock
+          tags: latest