fix(ci): improve script formatting and echo image tag in build process

1 job for sub2api/v0.0.1 in 2 seconds
latest
Name Stage Failure
failed
sub2api Build
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded
$ docker build -f Dockerfile --build-arg VERSION="${VERSION}" --build-arg COMMIT="${COMMIT}" --build-arg DATE="${DATE}" -t "$HARBOR_SERVICE/$HARBOR_REGISTRY/sub2api:${IMAGE_TAG}" .
invalid argument "harbor.linkfog.cn/sub2api/sub2api:" for "-t, --tag" flag: invalid reference format
See 'docker build --help'.
Cleaning up project directory and file based variables
ERROR: Job failed: exit status 1