Command to create a tag for a manifest in the remote registry

[qweeah]

The proposed command is:

Usage:
  oras tag  REPO:<TAG|DIGEST> NEW_TAG

Flags:
  --ca-file string               server certificate authority file for the remote registry
  -d, --debug                    debug mode
  -h, --help                     help for tagging
      --insecure                 allow connections to SSL registry without certs
  -p, --password string          registry password or identity token
      --password-stdin           read password or identity token from stdin
      --plain-http               allow insecure connections to registry without SSL check
  -u, --username string          registry username
  -v, --verbose                  verbose output

Relate to #459

[wju-MSFT]

I will take care of this issue.

[wju-MSFT]

Do we need to support multi-tagging in one cmd? If so, what should we use as a delimiter. @FeynmanZhou @shizhMSFT

[sajayantony]

Let's use a multi-value flag similar to

➜ docker build -t hello-world:v1 -t hello-world:v2 .

This would avoid the need for a delimiter.

[shizhMSFT]

Linking #355

[FeynmanZhou]

Do we need to support multi-tagging in one cmd? If so, what should we use as a delimiter. @FeynmanZhou @shizhMSFT
@jwang1013 @oras-project/oras-maintainers

It makes sense to support multi-tagging in the oras push group instead of oras tag. There is a request from a user in #355. How about we create a separate issue to track multi-tagging in the oras push group?

[sajayantony]

Let's use a multi-value flag similar to

➜ docker build -t hello-world:v1 -t hello-world:v2 .

This would avoid the need for a delimiter.

I realized that multiple flag values would mean you can pass in different repos. This might not be a good idea now and the comma separated values are probably better.