Add docker run image:tag completion support

[lucieleblanc]

Summary

Handle the image:tag colon-delimited pattern in docker run completions. When a user types docker run <image>:<TAB>, the completions menu now suggests available tags for that image.

Resolves APP-3480

Changes

• New generator run_image_with_tags in docker.rs: Uses command_from_tokens to detect a colon in the current token.
  • No colon (e.g., docker run <TAB>): Lists all images with metadata (same as previous behavior)
  • Colon present (e.g., docker run nginx:<TAB>): Extracts the image name and lists available local tags for that image
• Updated relevant subcommand JSON specs to use the new generator
• Removed dead code

Screenshots

docker run <TAB> — Image listing (normal mode)

docker run alpine:<TAB> — Tag completion

docker run nginx:<TAB> — Tag completion

Testing

• All existing tests pass (script/presubmit)
• Verified end-to-end with a local Warp build against Docker images with multiple tags (alpine:latest, alpine:3.18, alpine:3.19, nginx:latest, nginx:alpine)

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Conversation: https://staging.warp.dev/conversation/54b392e1-150a-464c-b621-8e1e53af592c
Run: https://oz.staging.warp.dev/runs/019d4b05-f012-73e8-9a12-cac1c5d45b82

This PR was generated with Oz.

[linear]

APP-3480 [Docker] Handle image:tag colon-delimited pattern in docker run

docker run <image>:<TAB> should suggest available tags for that image. The existing generator lists images but doesn't handle the colon-delimited image:tag pattern for tag-specific completion.

See GitHub #4489

[lucieleblanc]

Re-validation of image_with_tags generator

Tested the unified image_with_tags generator end-to-end in a local Warp build with the following Docker images: nginx:latest, nginx:alpine, ubuntu:latest, alpine:latest.

Test 1: docker run <Tab> — Image name completions (no colon)

Shows all local images with metadata (ID, tag, size):

Test 2: docker run nginx:<Tab> — Tag completions (with colon)

Shows only tags for the nginx image (nginx:alpine, nginx:latest):

Test 3: docker image history <Tab> — Image name completions

Shows all local images for docker image history subcommand:

Test 4: docker image history nginx:<Tab> — Tag completions

Shows only tags for nginx in the docker image history context:

Summary

All tests pass — the image_with_tags generator correctly:

• Lists all local images by default (without colon)
• Switches to showing tags for a specific image when a colon is typed
• Works across multiple subcommands (docker run, docker image history, etc.)

[lucieleblanc]

Screenshots: