This change reworked the vmware/harbor-db image to build it on top of
vmware/mariadb-photon.
Also made minor change in the entrypoint script of mariadb image to
execute upgrade script during bootstrap, and fix a file permission
issue in the bootstrap scripts.
The certificate verification is on system level before this commit. Moving it
to target level makes the configuration more flexible for different targets.
The following features are only enabled in integration mode, this commit moves
these to standalone Harbor:
- Content trust policy: only signed images can be pulled
- Vulnerability policy: only images whose severity is below the threshold can be pulled
- Automatic scan policy: automatic scan pushed images
