Auto pr

[dhidalgX]

Adding a reusable action for Automating PR creation, needed when fluxcd triggers a image automation.
I think this PR can wait until Joshua is back.

[joshuasing]

Is space-separated ideal here? I think comma-separated could be more consistent (e.g. with reviewers):

Suggested change

	IFS=' ' read -r -a allowed <<< "${{ inputs.allowed-branches }}"
	IFS=',' read -r -a allowed <<< "${{ inputs.allowed-branches }}"

[joshuasing]

Using ${{ }} syntax within run is dangerous -- as it is replaced before the script is executed, and allows script injection.

Instead, it is best to use environment variables to pass in the variables, e.g.

      env:
        ALLOWED_BRANCHES: "${{ inputs.allowed-branches }}"
      run: |
        echo "$ALLOWED_BRANCHES"