fix(action): Print get.docker.com error messages

Replace --fail with --fail-with-body in cURL invocation that downloads
the rootless Docker install script. This causes cURL to display any
error message it may receive from the server, which is often helpful
context to have when debugging.

action.yaml

@@ -47,7 +47,7 @@ runs:
 
         install_script_output="$(
           curl \
-          --fail \
+          --fail-with-body \
           --silent \
           --show-error \
           --location https://get.docker.com/rootless |