Truncate diffs to avoid failing actions - Argument list too long

[allenporter]

Example run: https://github.com/allenporter/k8s-gitops/actions/runs/5099732326/jobs/9167613119

The output is so large it fails the action. We should instead have an option to truncate the diff and return a partial result.

[allenporter]

Here is a related feature request for dyff: homeport/dyff#280

[allenporter]

This works so that the flux diff output succeeds, but now the output fails when adding the PR comment:

Error: An error occurred trying to start process '/home/runner/runners/2.304.0/externals/node16/bin/node' with working directory '/home/runner/work/k8s-gitops/k8s-gitops'. Argument list too long

[xakaitetoia]

Have same issue. Tried to Add resources requests on kube-prometheus-stack for all components 😬

Error: An error occurred trying to start process '/usr/bin/docker' with working directory '/home/runner/_work'. Argument list too long

1000 lines atm from the gh job

[jfroy]

One way to work around this in a workflow is to output the diff to a file and use an action to post the diff file. I've done this with hacky Markdown formatting in https://github.com/jfroy/flatops/blob/main/.github/workflows/flux-diff.yaml.