fix(ci): use correct postgres secret name for dev deploy

The deploy-dev job referenced `groombook-postgres-credentials` but
the groombook-dev namespace only has `groombook-postgres-credentials-dev`.
This caused all PR migration jobs to fail with CreateContainerConfigError.

Fixes GRO-66 deploy blocker.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/ci.yml

@@ -233,7 +233,7 @@ jobs:
                   - name: DATABASE_URL
                     valueFrom:
                       secretKeyRef:
-                        name: groombook-postgres-credentials
+                        name: groombook-postgres-credentials-dev
                         key: uri
           EOF
           kubectl wait --for=condition=complete "job/migrate-pr-$PR_NUM" \