shell-script

1. Add data to template
$mustache ~/data.yaml ~/onboarding.template.patch > ~/onboarding.patch

2. Store lines from data.yaml in variables
${ IFS= read -r LINE1 && IFS= read -r LINE2 && IFS= read -r LINE3 && IFS= read -r LINE4; } < ~/data.yaml

3. Remove labels from variables (can't have space after VARIABLE= or it's read a command)
$NAMESPACE=${LINE1##* }
$GROUP=${LINE2##* }
$QUOTA=${LINE3##* }
$CLUSTER=${LINE4##* }

4. Create new branch
git checkout -b "onboard/$NAMESPACE"

5. Apply patch to branch
$git apply ~/onboarding.patch

6. Add the changed files
$git add ./cluster-scope/base/core/namespaces/$NAMESPACE/kustomization.yaml
$git add ./cluster-scope/base/core/namespaces/$NAMESPACE/namespace.yaml
$git add ./cluster-scope/overlays/prod/$CLUSTER/kustomization.yaml

7. Commit changes
$git commit -m "onboarding $NAMESPACE"

8. Push to remote
$git push -u origin HEAD

9. Create PR

$gh pr create -R tssala23/OFApps --title "Onboardng $NAMESPACE" --body "Onboarding for $NAMESPACE to the $CLUSTER cluster" -f

Caveat
- PR require gh auth login first
- PR request specific to my repo
- More meta data will be sent to pipeline e.g. description, which can be written into PR