Build: Fix shell script run under Windows OS

[arittner]

A small fix up that allows almost all sbt make(-*) commands to run under Windows (except sbt make-deb, as a workaround a dev should use a Linux subsystem). There is also a small refactoring included to call Elm now also via Cmd.run.

I checked in parallel to use JDebPackaging instead of DebianPlugin but I faced a bug in the JDebPackaging (maybe a bug in the plugin or in the config). I postpone this adjustment until I have found a solution for it. Because then the complete build would be possible under Windows.

[arittner]

Ups...

"Some checks were not successful"

[info] Failed to check the site
[info] Error: Dead link in /home/runner/work/docspell/docspell/website/site/content/docs/install/quickstart.md to https://www.unraid.net/: Server error status code (500 Internal Server Error) received
[error] java.lang.RuntimeException: Unsuccessful return: 1
[error] 	at scala.sys.package$.error(package.scala:30)
[error] 	at docspell.build.Cmd$Result.throwIfNot(Cmd.scala:13)
[error] 	at docspell.build.Cmd$.run(Cmd.scala:22)

Interesting.

[arittner]

The dead link error is correct. The web page is not available. I get a 500 error with https://www.unraid.net/

But I don't know if this is a permanent error (and it was not visible before my change) or this is a temporary random parallel issue. 😀

[eikek]

Thank you! For the deb packange, I wouldn't put too much effort in this. It is build by github actions only (most of the time :)) and I think it's totally fair to require a linux system to build these.

Don't worry about the dead links, I might exclude external links from this check - it is a bit annoying :).