Address review feedback on pre_start hook image resolution:
1. GetDependentImages now skips a hook image equal to the service image
(resolved via GetImageNameOrDefault), so `config --images` no longer
prints a duplicate line and pullRequiredImages no longer schedules a
redundant pull for it.
2. pullRequiredImages (up/create path) now dedups dependent images by
reference via a `scheduled` set, so several hooks/services sharing the
same missing image don't schedule concurrent redundant pulls. The hook
pass moved to a helper (addPreStartHookPulls) to keep complexity in check.
3. The `pull` command no longer skips hook images under `pull_policy: build`.
A hook image is a registry image that can't be built, so only `never`
justifies skipping it — making `pull` consistent with the `up` path.
Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>
pre_start hooks run as ephemeral init containers with their own image
(ServiceHook.Image), but that image was ignored by image resolution:
`config --images` didn't list it, `pull` didn't fetch it, and `up` failed
at runtime with "No such image" when it wasn't already present locally.
Add a GetDependentImages helper that returns a service's pre_start hook
images, and use it wherever service images are collected/pulled:
getLocalImagesDigests, pullRequiredImages (up path), the pull command, and
`config --images`. Hook images inherit the parent service pull policy.
post_start/pre_stop hooks run via ExecCreate inside the service container
and never use hook.Image, so they are intentionally out of scope.
Digest resolution/locking (--resolve-image-digests / --lock-image-digests)
is not covered: compose-go's WithImagesResolved only resolves service.Image
(needs an upstream change), and the --lock-image-digests override merges
pre_start by concatenation, which would duplicate hooks.
Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>
