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fix: run as runner user + redirect bun temp to writable /home/runner

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Running as root breaks Claude CLI (refuses to start). Running as runner
breaks bun (can't write to root-owned /tmp dirs from Docker build).

Fix: run as --user runner, but redirect BUN_TMPDIR and TMPDIR to
/home/runner/.cache/bun which is writable by the runner user.
GITHUB_ENV exports apply to all subsequent steps.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Garry Tan
2026-03-23 17:59:23 -07:00
parent 470ac394d5
commit 9dc04020a4
2 changed files with 12 additions and 7 deletions
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.github/docker/Dockerfile.ci
+2 -5
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@@ -59,8 +59,5 @@ RUN useradd -m -s /bin/bash runner \
&& chmod -R a+rX /opt/node_modules_cache \
&& mkdir -p /home/runner/.gstack && chown -R runner:runner /home/runner/.gstack \
&& chmod 1777 /tmp \
&& mkdir -p /home/runner/.bun && chown -R runner:runner /home/runner/.bun
# NOTE: Do NOT use USER runner here — GH Actions overrides USER and HOME
# anyway, creating permission conflicts. Instead, we run as root (GH default)
# and use gosu/su-exec for claude commands that refuse root.
&& mkdir -p /home/runner/.bun && chown -R runner:runner /home/runner/.bun \
&& chmod -R 1777 /tmp