[TEST] yaml-diff colour output demo

[weatherhog]

Throwaway demo PR for roadmap#4121 — to view the colourised yaml-diff bot comment now that github-workflows#232 is on @main.

Changes two lines of a ConfigMap's data.values. Expect the bot to post a ```diff block where the removed lines render red, the added lines green, and the file header (@@ … @@) stands out. Close after eyeballing.

[github-actions]

Semantic YAML source diff — key reordering without value changes is ignored.

Output

@@ management-clusters/MC_NAME/organizations/ORG_NAME/workload-clusters/WC_NAME_OUT_OF_BAND_FLUX_APP/out-of-band/configmaps/configmap.yaml @@

/data/values
  ± value change in multiline text (two inserts, two deletions)
-     Test ConfigMap.
+     Test ConfigMap (colour demo).
-     Encryption is possible here as well, but I am not encrypted atm.
+     Encryption is possible here as well, but I am not encrypted yet.

Suppress with /no_diffs_printing on its own line in the PR body or as a comment.

[github-actions]

Validation output log

yamllint: OK
kubeconform: OK

yamllint: OK
kubeconform: OK

yamllint: OK
kubeconform: OK

yamllint: OK
kubeconform: OK

yamllint: OK
kubeconform: OK

yamllint: OK
kubeconform: OK

yamllint: OK
kubeconform: OK

yamllint: OK
kubeconform: OK

yamllint: OK
kubeconform: OK

[github-actions]

Rendered manifest diff output log

No diff detected