Set HOME in deploy workflow so ssh can resolve a home dir
The Tangled spindle runner has no /etc/passwd entry for uid 0, so
tilde expansion and ssh's own home-dir lookup fail with "No user
exists for uid 0". Pointing HOME at a fresh temp dir sidesteps both.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>