Add a registry pull proxy

[dwillist]

Signed-off-by: dwillist [email protected]

Summary

Output

Before

All image pulls would come from the registry specified in their name Eg index.docker.io/repo/name:latest would pull from index.docker.io

After

You can specify a pull proxy that re-directs all image pulls. If passed the --pull-proxy index.proxy.io/proxy_registry all image pulls will be routed through this proxy instead of their original.

Documentation

• Should this change be documented?
  • Yes, see #___
  • No

Related

Resolves #___

[dwillist]

Just to document the state of affairs in the PR.

Whats implemented so far.

The changes needed to be able to pack build with and pass a --pull-proxy flag so that all image pulls go through this proxy.

In general the other pack commands will likely need to have a optional --pull-proxy flag added as well and need to have logic similar to this so that image pulls are forced through the proxy.

Would recommend setting up harbor to test these other commands.

Other commands:

• inspect image
• builder create
• builder inspect
• buildpack inspect
• buildpack package
• rebase

[dfreilich]

Closing in favor of #1210