feat: support for grabbing latest from master

[jef]

It'd be nice to have multiple versions to grab from calibre-web.

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Expected Behavior

Adding a Docker tag of nightly like beets would be beneficial as releases don't happen as often as other services (Sonarr, Radarr, etc).

Current Behavior

Only includes latest release.

[jef]

I believe this can be solved by using CALIBREWEB_RELEASE to master. Maybe should just update the doc to include this unless it's somewhere else that specifies this configuration?

[aptalca]

if you're just troubleshooting, you can build it locally and pass the docker arg. Instructions are in the readme: https://github.com/linuxserver/docker-calibre-web#building-locally

Before we decide to publish a new tag, we'd have to take into consideration various things like how much interest there is for building master commits, how stable they are, how frequent they are, etc.

[jef]

Releases seem to vary. Most things pushed to master are fixes rather than features it seems. I'll build locally for now and go from there.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.