Upgrade operator-sdk to v1.40.0 and remove kube-rbac-proxy

Bump operator-sdk, ansible-operator, and OPM binaries to align with
the OCP 4.20 / AAP 2.7 target. Replace the deprecated kube-rbac-proxy
sidecar (removed in operator-sdk v1.38.0) with controller-runtime's
built-in WithAuthenticationAndAuthorization for metrics endpoint
protection.

Changes:
- Makefile: operator-sdk v1.36.1 → v1.40.0, OPM v1.26.0 → v1.55.0
- Dockerfile: ansible-operator base image v1.36.1 → v1.40.0
- Remove kube-rbac-proxy sidecar and auth_proxy_* RBAC manifests
- Add metrics_auth_role, metrics_reader, and metrics_service resources
- Add --metrics-secure, --metrics-require-rbac, --metrics-bind-address
  flags via JSON patch to serve metrics directly from the manager on
  port 8443 with TLS and RBAC authentication

Ref: AAP-65254

Authored By: Christian M. Adams <chadams@redhat.com>
Assisted By: Claude

config/default/kustomization.yaml

@@ -20,11 +20,11 @@ resources:
 - ../manager
 # [PROMETHEUS] To enable prometheus monitor, uncomment all sections with 'PROMETHEUS'.
 #- ../prometheus
+- metrics_service.yaml
 
-# Protect the /metrics endpoint by putting it behind auth.
-# If you want your controller-manager to expose the /metrics
-# endpoint w/o any authn/z, please comment the following line.
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 patches:
-- path: manager_auth_proxy_patch.yaml
+- path: manager_metrics_patch.yaml
+  target:
+    kind: Deployment

config/default/manager_auth_proxy_patch.yaml

@@ -1,40 +0,0 @@
-# This patch inject a sidecar container which is a HTTP proxy for the
-# controller manager, it performs RBAC authorization against the Kubernetes API using SubjectAccessReviews.
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: controller-manager
-  namespace: system
-spec:
-  template:
-    spec:
-      containers:
-      - name: kube-rbac-proxy
-        securityContext:
-          allowPrivilegeEscalation: false
-          capabilities:
-            drop:
-            - "ALL"
-        image: gcr.io/kubebuilder/kube-rbac-proxy:v0.15.0
-        args:
-        - "--secure-listen-address=0.0.0.0:8443"
-        - "--upstream=http://127.0.0.1:8080/"
-        - "--logtostderr=true"
-        - "--v=0"
-        ports:
-        - containerPort: 8443
-          protocol: TCP
-          name: https
-        resources:
-          limits:
-            cpu: 500m
-            memory: 128Mi
-          requests:
-            cpu: 5m
-            memory: 64Mi
-      - name: awx-manager
-        args:
-        - "--health-probe-bind-address=:6789"
-        - "--metrics-bind-address=127.0.0.1:8080"
-        - "--leader-elect"
-        - "--leader-election-id=awx-operator"

config/default/manager_metrics_patch.yaml

@@ -0,0 +1,12 @@
+# This patch adds the args to allow exposing the metrics endpoint using HTTPS
+- op: add
+  path: /spec/template/spec/containers/0/args/0
+  value: --metrics-bind-address=:8443
+# This patch adds the args to allow securing the metrics endpoint
+- op: add
+  path: /spec/template/spec/containers/0/args/0
+  value: --metrics-secure
+# This patch adds the args to allow RBAC-based authn/authz for the metrics endpoint
+- op: add
+  path: /spec/template/spec/containers/0/args/0
+  value: --metrics-require-rbac

config/default/metrics_service.yaml

@@ -3,6 +3,8 @@ kind: Service
 metadata:
   labels:
     control-plane: controller-manager
+    app.kubernetes.io/name: awx-operator
+    app.kubernetes.io/managed-by: kustomize
   name: controller-manager-metrics-service
   namespace: system
 spec:
@@ -10,6 +12,7 @@ spec:
   - name: https
     port: 8443
     protocol: TCP
-    targetPort: https
+    targetPort: 8443
   selector:
     control-plane: controller-manager
+    app.kubernetes.io/name: awx-operator

config/manager/manager.yaml

@@ -38,6 +38,7 @@ spec:
       - args:
         - --leader-elect
         - --leader-election-id=awx-operator
+        - --health-probe-bind-address=:6789
         image: controller:latest
         imagePullPolicy: IfNotPresent
         name: awx-manager

config/rbac/kustomization.yaml

@@ -9,10 +9,6 @@ resources:
 - role_binding.yaml
 - leader_election_role.yaml
 - leader_election_role_binding.yaml
-# Comment the following 4 lines if you want to disable
-# the auth proxy (https://github.com/brancz/kube-rbac-proxy)
-# which protects your /metrics endpoint.
-- auth_proxy_service.yaml
-- auth_proxy_role.yaml
-- auth_proxy_role_binding.yaml
-- auth_proxy_client_clusterrole.yaml
+- metrics_auth_role.yaml
+- metrics_auth_role_binding.yaml
+- metrics_reader_role.yaml

config/rbac/metrics_auth_role.yaml

@@ -1,7 +1,7 @@
 apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRole
 metadata:
-  name: proxy-role
+  name: metrics-auth-role
 rules:
 - apiGroups:
   - authentication.k8s.io

config/rbac/metrics_auth_role_binding.yaml

@@ -1,11 +1,11 @@
 apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding
 metadata:
-  name: proxy-rolebinding
+  name: metrics-auth-rolebinding
 roleRef:
   apiGroup: rbac.authorization.k8s.io
   kind: ClusterRole
-  name: proxy-role
+  name: metrics-auth-role
 subjects:
 - kind: ServiceAccount
   name: controller-manager