Use metadata to determine namespace in args

Use an env to get the metadata.namespace, and then use a variable
in the arguments to get the value. Avoids putting the namespace
into the manifest.

Signed-off-by: Todd Short <[email protected]>

Author: tmshort

config/base/catalogd/manager/manager.yaml

@@ -46,7 +46,12 @@ spec:
         args:
         - --leader-elect
         - --metrics-bind-address=:7443
-        - --external-address=catalogd-service.olmv1-system.svc
+        - --external-address=catalogd-service.$(POD_NAMESPACE).svc
+        env:
+          - name: POD_NAMESPACE
+            valueFrom:
+              fieldRef:
+                fieldPath: metadata.namespace
         image: controller:latest
         name: manager
         volumeMounts: