argocd: Configure SSO for CLI

The `argocd` command needs to have its own OIDC client configuration,
since it works like a "public" client.  To log in, run

```sh
argocd login argocd.pyrocufflink.blue --sso
```

argocd/argocd-cm.yml

@@ -1,7 +0,0 @@
-url: https://argocd.pyrocufflink.blue
-
-oidc.config: |
-  name: Authelia
-  issuer: https://auth.pyrocufflink.blue
-  clientID: argocd
-  clientSecret: $oidc.authelia.clientSecret

argocd/oidc.config

@@ -2,3 +2,4 @@ name: Authelia
 issuer: https://auth.pyrocufflink.blue
 clientID: argocd
 clientSecret: $oidc.authelia.clientSecret
+cliClientID: argocd-cli