fix: add imagePullSecrets regcred to users deployment pod template

apps/nxtgauge-backend-rust/base/serviceaccount-default.yaml

@@ -5,4 +5,3 @@ metadata:
   namespace: nxtgauge
 imagePullSecrets:
   - name: regcred
-

apps/nxtgauge-backend-rust/base/users-deployment.yaml

@@ -14,6 +14,8 @@ spec:
       labels:
         app: nxtgauge-rust-users
     spec:
+      imagePullSecrets:
+        - name: regcred
       containers:
         - name: users
           image: registry.nxtgauge.com/nxtgauge-rust-users