fix: use forgejo-runner register --token instead of create-runner-file --secret

The UI registration token is not a hex string — create-runner-file --secret
expects a hex secret. Use the register subcommand with --token instead,
which accepts the token from the Forgejo UI directly.

https://claude.ai/code/session_01FKCW3FDjNFj6jve4niMFXH

infra/runner-entrypoint.sh

@@ -10,11 +10,12 @@ CONFIG=/data/.runner
 
 if [ ! -f "$CONFIG" ]; then
     echo "[runner] No registration found — registering with Forgejo…"
-    forgejo-runner create-runner-file \
+    forgejo-runner register \
         --instance  "${FORGEJO_INSTANCE_URL}" \
-        --secret    "${FORGEJO_RUNNER_TOKEN}" \
+        --token     "${FORGEJO_RUNNER_TOKEN}" \
         --name      "${FORGEJO_RUNNER_NAME:-hiy-runner}" \
-        --connect
+        --labels    "ubuntu-latest:docker://node:20-bookworm,ubuntu-22.04:docker://node:20-bookworm" \
+        --no-interactive
     echo "[runner] Registration complete."
 fi