very hacky multiple keycloaks!

See https://git.coopcloud.tech/coop-cloud/matrix-synapse/issues/24.

homeserver.yaml.tmpl

@@ -1897,6 +1897,19 @@ oidc_providers:
         display_name_template: "{{ "{{ user.name }}" }}"
   {{ end }}
 
+  {{ if eq (env "KEYCLOAK2_ENABLED") "1" }}
+  - idp_id: keycloak2
+    idp_name: {{ env "KEYCLOAK2_NAME" }}
+    issuer: "{{ env "KEYCLOAK2_URL" }}"
+    client_id: "{{ env "KEYCLOAK2_CLIENT_ID" }}"
+    client_secret: "{{ secret "keycloak2_client_secret" }}"
+    scopes: ["openid", "profile"]
+    user_mapping_provider:
+      config:
+        localpart_template: "{{ "{{ user.preferred_username }}" }}"
+        display_name_template: "{{ "{{ user.name }}" }}"
+  {{ end }}
+
 
 # Enable Central Authentication Service (CAS) for registration and login.
 #