Fix error in docker workflow step (#23)

.github/workflows/go_ext.yml

@@ -32,5 +32,12 @@ jobs:
       - name: Format
         run: test -z $(gofmt -l .)
 
+- name: Build and push Docker image
+      uses: docker/build-push-action@v2
+      with:
+        context: ./extension/tgbot
+        push: true
+        tags: iamthen0ise/w2r-tgbot:latest
+      if: github.ref == 'refs/heads/master'
       - name: Build
         run: go build -v ./...