roachprod: gc ibm cloud

The roachprod GC job had not been updated since we started running
automated tests on IBM Cloud. This patch updates the job to the latest
release and makes it aware of IBM Cloud credentials.

Epic: CRDB-21133
Fixes: #143789
Release note: None

Author: golgeek

pkg/roachprod/k8s/roachprod-gc.yaml

@@ -31,7 +31,7 @@ spec:
         spec:
           containers:
             - name: roachprod-gc-cronjob
-              image: gcr.io/cockroach-dev-inf/cockroachlabs/roachprod:ea736e6ab07
+              image: gcr.io/cockroach-dev-inf/cockroachlabs/roachprod:fd18c1bd63d
               args:
                 - gc
                 - --gce-project=cockroach-ephemeral,cockroach-roachstress
@@ -40,6 +40,11 @@ spec:
                 - --aws-account-ids=541263489771,337380398238
                 - --azure-subscription-names=e2e-adhoc,e2e-infra,Microsoft Azure Sponsorship
               env:
+                - name: IBM_APIKEY
+                  valueFrom:
+                    secretKeyRef:
+                      name: roachprod-gc-cronjob-creds
+                      key: ibm_apikey
                 - name: SLACK_TOKEN
                   valueFrom:
                     secretKeyRef: