Add krankerl github action

[icewind1991]

Why be forced to do

      - name: Setup krankler
        run: |
          wget https://github.com/ChristophWurst/krankerl/releases/download/v0.13.0/krankerl
          chmod +x krankerl
      - name: Package app
        run: ./krankerl package

When you could be doing

      - name: Package app
        uses: ChristophWurst/krankerl@v1
        with:
          - command: package

That is 33% less time spend writing ci setups

[ChristophWurst]

plus you can use dependabot to receive bumps to new versions

[splitt3r]

Maybe also publish as Docker image (on GitHub Container Registry) and reuse that for the GitHub Action? Otherwise https://github.com/actions-rs/cargo/blob/master/src/main.ts looks like a good starting point.