feat: sso vals for mattermost

chart/dev-sso-values.yaml

@@ -75,3 +75,8 @@ addons:
     sso:
       enabled: true
       client_id: platform1_a8604cc9-f5e9-4656-802d-d05624370245_bb8-confluence
+  mattermost:
+    sso:
+      enabled: true
+      client_id: "platform1_a8604cc9-f5e9-4656-802d-d05624370245_bb8-mattermost"
+      client_secret: "no-secret"

chart/templates/mattermost/mattermost/mattermost-helmrelease.yaml

@@ -52,7 +52,7 @@ spec:
     sso:
       enabled: {{ .enabled }}
       client_id: {{ .client_id }}
-      client_secret: {{ .client_secret }}
+      client_secret: {{ .client_secret | default "no-secret" }}
       auth_endpoint: {{ .auth_endpoint | default (printf "https://%s/oauth/authorize" $.Values.sso.oidc.host) }}
       token_endpoint: {{ .token_endpoint | default (printf "https://%s/oauth/token" $.Values.sso.oidc.host) }}
       user_api_endpoint: {{ .user_api_endpoint | default (printf "https://%s/api/v4/user" $.Values.sso.oidc.host) }}