chart: Expose the speaker's name as env variable and update rbac config

Use k8s downward api to expose speaker pod name as env variable.

Update the rbac config to allow the speaker to get the speaker pod.

With these modification, metallb installation from helm can work correctly.

Signed-off-by: lwabish <wubw@pku.edu.cn>

charts/metallb/templates/rbac.yaml

@@ -79,7 +79,7 @@ metadata:
 rules:
 - apiGroups: [""]
   resources: ["pods"]
-  verbs: ["list"]
+  verbs: ["list", "get"]
 - apiGroups: [""]
   resources: ["secrets"]
   verbs: ["get", "list", "watch"]

charts/metallb/templates/speaker.yaml

@@ -288,6 +288,10 @@ spec:
         - name: METALLB_BGP_TYPE
           value: frr-k8s
         {{- end }}
+        - name: METALLB_POD_NAME
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.name
         ports:
         - name: monitoring
           containerPort: {{ .Values.prometheus.metricsPort }}