restore manager bootstrap creds for subscription ID

config/capz/credentials.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: manager-bootstrap-credentials
+  namespace: system
+type: Opaque
+data:
+  subscription-id: ${AZURE_SUBSCRIPTION_ID_B64:=""}

config/capz/kustomization.yaml

@@ -10,6 +10,7 @@ labels:
 
 resources:
 - namespace.yaml
+- credentials.yaml
 - ../crd
 - ../rbac
 - ../manager
@@ -19,6 +20,7 @@ resources:
 patches:
 - path: manager_image_patch.yaml
 - path: manager_pull_policy.yaml
+- path: manager_credentials_patch.yaml
 - path: manager_webhook_patch.yaml
 - path: validatingwebhookcainjection_patch.yaml
 - path: mutatingwebhookcainjection_patch.yaml

config/capz/manager_credentials_patch.yaml

@@ -0,0 +1,16 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: controller-manager
+  namespace: system
+spec:
+  template:
+    spec:
+      containers:
+      - name: manager
+        env:
+          - name: AZURE_SUBSCRIPTION_ID
+            valueFrom:
+              secretKeyRef:
+                name: manager-bootstrap-credentials
+                key: subscription-id