fix: bump actions-runner to 2.336.0 (#20)

* fix: track actions-runner latest tag

GitHub rejects job messages from runner versions that fall out of the
support window, and ARC disables runner self-update, so a pinned base
image silently breaks every runner once it expires (2.334.0 now returns
403 and exit code 7). Tracking latest avoids the recurring outage; the
build forces a base image pull so inline cache cannot pin a stale digest.

Co-authored-by: Cursor <cursoragent@cursor.com>

* fix: pin actions-runner to 2.336.0

latest only resolves at build time; a published image is still a frozen
snapshot, so tracking latest does not avoid the next deprecation outage
and obscures which runner version each release contains. Pin 2.336.0
explicitly (current actions/runner release) to unblock ARC runners that
fail with exit code 7 on deprecated 2.334.0.

Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: zzswang

Dockerfile

@@ -1,4 +1,4 @@
-FROM ghcr.io/actions/actions-runner:2.334.0
+FROM ghcr.io/actions/actions-runner:2.336.0
 
 RUN sudo apt update -y && \
   sudo apt install -y curl make bash jq