* Add support for recursively resolving directory symlinks.
This adds support for properly resolving directory symlinks within kodata.
I verified that with this I can symlink `.git/refs` into `kodata/` and (with
changes) resolve the `.git/HEAD` symlink to read the appropriate
`ref: refs/heads/...` files with the commit SHA.
* Incorporate code review feedback
When ko is invoked in this mode, import paths must have the `ko://`
prefix. If a human marks an import path with `ko://` and ko can't
resolve the resulting import path, it fails. In "loose mode", such an
import path would be silently ignored and passed on to the resolved
YAML, often resulting in invalid image names (e.g., `image:
github.com/foo/bar`)
In loose mode, `ko://` prefixes are always ignored for
backward-compatibility.
Why this is necessary: when using a local docker registry, users may not
want to support https, or there may be other troubles not allowing
verifiable TLS support.
This commit adds this functionality by adding an `--insecure-registry`
flag.
This hoists the publisher creation out of the loop for `ko publish` to
avoid needlessly resolving credentials multiple times.
This pulls the publisher creation outside of resolveFilesToWriter so we
can fail earlier if e.g. KO_DOCKER_REPO is unset, otherwise we start up
the kubectl goroutine and it would asynchronously fail with:
error: no objects passed to apply
