Fix go get failure due to unresolvable nested module dependency

[Copilot]

go get github.com/docker/model-runner fails with "invalid version: unknown revision 000000000000" because the nested pkg/go-containerregistry module uses a local path replace directive that doesn't work outside the repository.

Changes

• pkg/go-containerregistry/go.mod: Change module path from github.com/google/go-containerregistry to github.com/docker/model-runner/pkg/go-containerregistry to match import paths
• go.mod: Remove local path replace directive and use pseudo-version v0.0.0-20251121145743-8846041bd600 for nested module dependency
• go.work: Add pkg/go-containerregistry to workspace for local development

The nested module is now resolvable directly from the repository without requiring a local filesystem path, making the module consumable via go get.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• go.googlesource.com
  • Triggering command: /usr/lib/git-core/git-remote-https /usr/lib/git-core/git-remote-https origin REDACTED (dns block)
  • Triggering command: /usr/bin/go go get github.com/docker/model-REDACTED@latest (dns block)
• gonum.org
  • Triggering command: /usr/bin/go go get github.com/docker/model-REDACTED@latest (dns block)
• howett.net
  • Triggering command: /usr/bin/go go get github.com/docker/model-REDACTED@latest (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

This doesn't work anymore, fix it:

docker run --rm -it golang sh -c "mkdir test && cd test && go mod init test && go get github.com/docker/model-runner"

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