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Label rework + clearer messages (#228)

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- Moved up label check and logic to earlier in the process, to iterate the whole run the same way if `-l` option is passed.
- Added messaging to make it clearer.
- Clarified Readme and --help message.
- Clarified prune message (to mean ALL dangling, not just currently updated).
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README.md
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@ -69,7 +69,7 @@ Options:
-h Print this Help.
-i Inform - send a preconfigured notification.
-I Prints custom releasenote urls alongside each container with updates in CLI output (requires urls.list).
-l Only update if label is set. See readme.
-l Only include containers with label set. See readme.
-m Monochrome mode, no printf colour codes and hides progress bar.
-M Prints custom releasenote urls as markdown (requires template support).
-n No updates, only checking availability.
@ -283,10 +283,12 @@ Optionally add labels to compose-files. Currently these are the usable labels:
mag37.dockcheck.only-specific-container: true
mag37.dockcheck.restart-stack: true
```
- `mag37.dockcheck.update: true` will when used with the `-l` option only update containers with this label and skip the rest. Will still list updates as usual.
- `mag37.dockcheck.update: true` will when used with the `-l` option only check and update containers with this label set and skip the rest.
- `mag37.dockcheck.only-specific-container: true` works instead of the `-F` option, specifying the updated container when doing compose up, like `docker compose up -d homer`.
- `mag37.dockcheck.restart-stack: true` works instead of the `-f` option, forcing stop+restart on the whole compose-stack (Caution: Will restart on every updated container within stack).
Adding or modifying labels in compose-files requires a restart of the container to take effect.
## Workaround for non **amd64** / **arm64**
`regctl` provides binaries for amd64/arm64, to use on other architecture you could try this workaround.
Run regctl in a container wrapped in a shell script. Copied from [regclient/docs/install.md](https://github.com/regclient/regclient/blob/main/docs/install.md):