swag_ondemand mod: Use swag_url label to construct default container urls, if available

[pbaylas]

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• I have read the contributing guideline and understand that I have made the correct modifications

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Description:

When I was setting up swag_ondemand, it occurred to me that I'm basically duplicating the same information in the swag_ondemand_urls label that I've already set in swag_url label to make swag_auto_proxy so I figured it would make sense to do that automatically.

Benefits of this PR and context:

It makes using swag_ondemand and swag_auto_proxy slightly simpler to use together, and they already work great together. Plus it eliminates one place you might forget to update if you change the url of a container.

How Has This Been Tested?

I've manually tested it with all the containers I have swag_ondemand configured. I added logging so that it's clear what it's doing, and it's working for me with labels like this:

    container_name: openvscode-server
    labels:
      - swag=enable
      - swag_port=3000
      - swag_url=code.domain.net
      - swag_auth=authelia
      - swag_ondemand=enable
      - swag_server_custom_directive=include /config/nginx/ondemand.conf;
      - swag_location_custom_directive=error_page 502 = @waking_up;

Source / References:

[LinuxServer-CI]

PR build pushed to ghcr.io/linuxserver/mods:pull_request_1088

[quietsy]

PR build pushed to ghcr.io/linuxserver/mods:pull_request_1088

You can test it by using this tag ^ in the DOCKER_MODS env var. (rebase it on latest first to avoid testing twice)

[LinuxServer-CI]

PR build pushed to ghcr.io/linuxserver/mods:pull_request_1088

[LinuxServer-CI]

PR build pushed to ghcr.io/linuxserver/mods:pull_request_1088

[LinuxServer-CI]

PR build pushed to ghcr.io/linuxserver/mods:pull_request_1088

[LinuxServer-CI]

PR build pushed to ghcr.io/linuxserver/mods:pull_request_1088

[pbaylas]

PR build pushed to ghcr.io/linuxserver/mods:pull_request_1088

You can test it by using this tag ^ in the DOCKER_MODS env var. (rebase it on latest first to avoid testing twice)

Ah-ha! Very slick, thanks!

I've tested it now, and added some logging to make it clear which urls it's using, and it's working nicely for me.