feat: setup sbt-ci-release

[ckipp01]

NOTE: That before we'd be able to use this we'd need the following secrets setup:

          PGP_PASSPHRASE: ${{ secrets.PGP_PASSPHRASE }}
          PGP_SECRET: ${{ secrets.PGP_SECRET }}
          SONATYPE_PASSWORD: ${{ secrets.SONATYPE_PASSWORD }}
          SONATYPE_USERNAME: ${{ secrets.SONATYPE_USERNAME }}

[ckipp01]

Alright, all the env variables should be set. In theory upon merging this it should produce a snapshot.

[eloots]

Great stuff!

[mkurz]

👍