Try another way to lowercase the URL...
@@ -72,9 +72,9 @@ jobs:
# Push image to Docker Hub.
(
- echo DOCKER_IMAGE_URL=$DOCKER_IMAGE_URL
- docker tag $IMAGE_NAME $DOCKER_IMAGE_URL:$VERSION
- docker push $DOCKER_IMAGE_URL:$VERSION
+ echo DOCKER_IMAGE_URL=${DOCKER_IMAGE_URL,,}
+ docker tag $IMAGE_NAME ${DOCKER_IMAGE_URL,,}:$VERSION
+ docker push ${DOCKER_IMAGE_URL,,}:$VERSION
) &
wait
\ No newline at end of file
