Parameterize the actions/checkout ref for cartsnitch/infra in deploy-dev
and deploy-uat so the head branch lineage matches the PR base:
- main push -> ref: main, base: main (unchanged)
- dev push -> ref: dev, base: dev
- uat push -> ref: uat, base: uat
Before: ref: main was hardcoded, so the auto-opened image-tag-bump PR
in cartsnitch/infra was branched from main, not from dev/uat. With the
CAR-1371 base=dev/base=uat change, the diff ballooned to 30+ files and
the PR was unmergeable (see cartsnitch/infra#392).
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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