Add Keycloak SSO compose override file

compose.keycloak.yml

@@ -0,0 +1,14 @@
+version: "3.8"
+services:
+  app:
+    secrets:
+      - keycloak_client_id
+      - keycloak_client_secret
+
+secrets:
+  keycloak_client_id:
+    external: true
+    name: ${STACK_NAME}_keycloak_client_id_${SECRET_KEYCLOAK_CLIENT_ID_VERSION}
+  keycloak_client_secret:
+    external: true
+    name: ${STACK_NAME}_keycloak_client_secret_${SECRET_KEYCLOAK_CLIENT_SECRET_VERSION}