feat: add --image-mount flag to bake images-to-mount init scripts

[feloy]

Add support for loading images-to-mount YAML files and appending their shell init snippets to /sandbox/.bashrc and /sandbox/.zshrc inside the built image.

• src/image_mount.rs (new): parse images-to-mount YAML files (local path or URL), derive the mount name from the filename stem, and replace $MOUNT with /sandbox/mnt/ in the init value.

• src/containerfile.rs: introduce ContainerfileOptions struct to replace the positional argument list in generate(); add image_mount_inits field that emits printf calls appending each resolved init snippet to .bashrc and .zshrc in the same RUN layer that creates the profile files; add init_for_printf() helper that escapes backslashes, newlines, and single quotes for safe use in a single-quoted shell printf argument; add unit tests covering ordering, multiple mounts, single-quote escaping, and the no-mount-no-zshrc invariant.

• src/main.rs: add --image-mount <PATH|URL> CLI flag (clap Append action, repeatable); thread image_mounts through run(); add unit tests for single mount, multiple mounts, and invalid path error.

• tests/integration_test.rs: add image_mount module with integration tests (marked #[ignore] for those requiring podman) covering .bashrc and .zshrc content, sandbox ownership, and absence of .zshrc when the flag is not used; add non-ignored binary smoke-test for the invalid-path error path; register cleanup of the new test image tag.

• README.md: document the new flag — YAML format, $MOUNT substitution rule, files written, CLI examples, and option table entry.

How to use:

openshell-image-builder \
  --runtime podman \
  --agent claude \
  --image-mount https://raw.githubusercontent.com/feloy/images-to-mount/refs/heads/main/curl.yaml \
  --image-mount https://raw.githubusercontent.com/feloy/images-to-mount/refs/heads/main/git.yaml \
  claude-curl-git:1

DRIVER_CONFIG_JSON='{
  "podman": {
    "mounts": [
      {
        "type": "bind",
        "source": "'"$PWD"'",
        "target": "/sandbox/work",
        "read_only": false
      },
      {
        "type": "image",
        "source": "registry.access.redhat.com/hi/curl:latest",
        "target": "/sandbox/mnt/curl",
        "read_only": true
      },
      {
        "type": "image",
        "source": "registry.access.redhat.com/hi/git:latest",
        "target": "/sandbox/mnt/git",
        "read_only": true
      }
    ]
  }
}'

openshell sandbox create \
  --from claude-curl-git:1 \
  --driver-config-json "$DRIVER_CONFIG_JSON" \
  ...

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📥 Commits

Reviewing files that changed from the base of the PR and between babb09b and fa28e69.

📒 Files selected for processing (5)

• README.md
• src/containerfile.rs
• src/image_mount.rs
• src/main.rs
• tests/integration_test.rs

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[codecov]

Codecov Report

❌ Patch coverage is 99.22078% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/image_mount.rs	97.08%	3 Missing ⚠️

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