fix docker tag in GH Action

Author: frantuma

.github/workflows/maven-push-3.0.yml

@@ -97,10 +97,8 @@ jobs:
           then
             mvn -DJETTY_TEST_HTTP_PORT=8090 -DJETTY_TEST_STOP_PORT=8089 clean deploy -Pdocker --settings $HOME/.m2/settings.xml
             docker build --rm=false -t $DOCKER_GENERATOR_IMAGE_NAME:unstable -f ./modules/swagger-generator/Dockerfile_minimal ./modules/swagger-generator
-            docker tag $DOCKER_GENERATOR_IMAGE_NAME:unstable
             docker push $DOCKER_GENERATOR_IMAGE_NAME:unstable
             docker build --rm=false -t $DOCKER_CODEGEN_CLI_IMAGE_NAME:unstable ./modules/swagger-codegen-cli
-            docker tag $DOCKER_CODEGEN_CLI_IMAGE_NAME:unstable
             docker push $DOCKER_CODEGEN_CLI_IMAGE_NAME:unstable
           else
             echo "not building and pushing release docker image: " ${MY_POM_VERSION}