Run the E2E runner as the invoking user so its artifacts aren't root-owned

e2e-tests/compose.full.yml

@@ -2,7 +2,7 @@
 # login, menu filtering by permission, users/groups/OAuth2-clients CRUD + permission granting, a plugin page, logout. A
 # tiny same-origin gateway (proxy, e2e-tests/proxy.ts) fronts web + Kratos on one host so the browser's cookies
 # round-trip (ory/kratos/e2e-proxy.yml points Kratos at it); a mock OIDC provider backs the SSO test.
-#   docker compose -f compose.yml -f e2e-tests/compose.full.yml run --build --rm e2e
+#   docker compose -f compose.yml -f e2e-tests/compose.full.yml run --user "$(id -u):$(id -g)" --build --rm e2e
 #   docker compose -f compose.yml -f e2e-tests/compose.full.yml down -v   # tear down after
 services:
   web: