add workflow for updating deployed image tag

[haarg]

No description provided.

[haarg]

This is an alternative to metacpan/metacpan-web#3052. This puts the main workflow for updating images in the k8s repo, which can be used by multiple apps. It can be triggered from a workflow in the other repos like:

      - name: Update deployed image
        uses: aurelien-baudet/workflow-dispatch@v2
        with:
          repo: metacpan/metacpan-k8s
          workflow: set-image.yml
          token: ${{ steps.auth-token.outputs.access-token }}
          inputs: '{ "app": "web", "environment": "prod", "repository": "metacpan/metacpan-web", "tag": "${{ github.sha }}" }'

[ssoriche]

Wow, thanks for putting this together, didn't know it was possible.