fix(myorg-assistant): add missing GIT_TOKEN/GIT_REPO_URL/GIT_USERNAME to deadline-checker CronJob

The deadline-checker container crashed at import (pydantic ValidationError:
git_token field required) because the CronJob pod did not mount GIT_TOKEN
from myorg-assistant-secret, unlike the main Deployment. Added the three
git-related secret env vars so Settings() validates.

myorg-assistant/cronjobs/deadline-checker.yaml

@@ -59,6 +59,21 @@ spec:
                 secretKeyRef:
                   name: myorg-assistant-secret
                   key: WEB_SECRET_KEY
+            - name: GIT_REPO_URL
+              valueFrom:
+                secretKeyRef:
+                  name: myorg-assistant-secret
+                  key: GIT_REPO_URL
+            - name: GIT_USERNAME
+              valueFrom:
+                secretKeyRef:
+                  name: myorg-assistant-secret
+                  key: GIT_USERNAME
+            - name: GIT_TOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: myorg-assistant-secret
+                  key: GIT_TOKEN
             volumeMounts:
             - name: myorg-data
               mountPath: /data/myorg