Allow CA secret name to be specified for oidc-client

This commit allows the CA secret name for the oidc client to be
specified through a helm override.
By default, if no overrides are given, the secret name is
assumed to be dex-client-secret, same as the old forced secret name,
for compatibility with older systems.

Change-Id: I4a86f3262050a4638fd6f16192490ce1e1e11ff2
Story: 2007361
Task: 42649
Signed-off-by: Jerry Sun <jerry.sun@windriver.com>

stx-oidc-auth-helm/stx-oidc-auth-helm/helm-charts/oidc-client/templates/deployment.yaml

@@ -83,7 +83,7 @@ spec:
       volumes:
         - name: dex-client-secret-volume
           secret:
-            secretName: dex-client-secret
+            secretName: {{ .Values.config.issuer_root_ca_secret }}
         - name: https-tls
           secret:
             secretName: {{ .Values.tlsName }}

stx-oidc-auth-helm/stx-oidc-auth-helm/helm-charts/oidc-client/values.yaml

@@ -30,6 +30,7 @@ config:
   client_secret: St8rlingX
   issuer: https://10.10.10.3:30556/dex
   issuer_root_ca: /home/dex-ca.pem
+  issuer_root_ca_secret: dex-client-secret
   listen: https://0.0.0.0:5555
   redirect_uri: https://10.10.10.3:30555/callback