ci: Add UI inputs for `Update helm charts` job, refactor and drop need for `crds_asset_id`

Description

Fix https://github.com/kubewarden/helm-charts/issues/307

Changes:

Add UI inputs when workflow triggered as workflow_dispatch. Given that the values can come from repository_dispatch (other repos) or workflow_dispatch (UI button), add a new setvariables job, that sets its job outputs to the corresponding values obtained from the payload of the repository_dispatch or from the inputs of the workflow_dispatch. It is needed to use job outputs as is the only way to pass values between jobs, as jobs are run in their own VM instances and don't share the env. Make the following jobs depend on it with needs: setvariables. The javascript script from actions/github-script cannot read job outputs. Hence, add a step that reads the needs.setvariables.outputs and creates env vars. Consume those env vars in js as process.env.foo.
refactor: Calculate crds_asset_id by querying GH instead of passing it from the job.
refactor: Remove 2 repetitions of install_crds.sh, call update_cli/scripts/install_crds.sh.

Test

Major/minor release update run: https://github.com/viccuad/helm-charts/actions/runs/8263364335 Patch release update run: https://github.com/viccuad/helm-charts/actions/runs/8263508789/job/22605107087

Also, tested updatecli/scripts/install_crds.sh locally, with various /tmp/crds-{controller,audit-scanner}.tar.gz.

Additional Information

Tradeoff

Potential improvement

I don't like the added complexity created by adding the workflow_dispatch inputs, and needing to pass it to the js scripts via GH env vars, but it is what it is.

About the refactors, I'm happy splitting the commits in several PRs. I tested it altogether to save time. If they aren't wanted they can be dropped, or we can go with https://github.com/kubewarden/helm-charts/pull/399.

kubewarden / helm-charts