use GHCR mirror for cog-base images in integration tests (#2866)
* add workflow to mirror cog-base images from r8.im to GHCR
Add a workflow_dispatch workflow that copies cog-base images from r8.im
to ghcr.io/replicate/cog/cog-base using crane. Uses GITHUB_TOKEN for
GHCR authentication.
The list of tags to mirror is in integration-tests/cog-base-tags.txt
(4 CPU + 6 GPU base images used by integration tests).
Run this workflow from Actions > Mirror cog-base images > Run workflow
when new cog-base images are published or new tags are added.
* use GHCR mirror for cog-base images in integration tests
Set COG_REGISTRY_HOST=ghcr.io/replicate/cog in CI so integration tests
resolve cog-base images from GHCR instead of r8.im.
CI changes:
- Set COG_REGISTRY_HOST in the integration test job env
Harness changes:
- Add COG_REGISTRY_HOST to propagatedEnvVars so cog serve inherits it
Test simplification:
- 5 tests no longer need per-test registries since they can resolve
cog-base images from the GHCR mirror via COG_REGISTRY_HOST:
build_base_image_sha, build_cog_version_match,
build_python313_base_image, torch_cuda_baseimage,
torch_baseimage_fallback
