Migrate from Travis CI to GitHub Actions

[punycode]

With the availability of GitHub Actions, the 3rd party build integration with Travis CI becomes obsolete. GitHub Actions can be better integrated into the GitHub PR lifecycle.

TODOS:

• [x] Migrate the SonarCloud integration from Travis CI
• [ ] Migrate the release pipeline from Travis CI (removed)

[punycode]

@derTobsch Might need some help here, I currently do not really understand GitHub Actions OR Travis CI builds. It's mostly about the secrets, so maybe you can get back to me on this one, so we can move forward.

[derTobsch]

@derTobsch Might need some help here, I currently do not really understand GitHub Actions OR Travis CI builds. It's mostly about the secrets, so maybe you can get back to me on this one, so we can move forward.

Added some commits and secrets :) So maybe "only" the release workflow is missing

[derTobsch]

@punycode should we merge this and add the release workflow in another pr?

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!

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