ci: distcc-avahi-aarch64 continue-on-error

distcc-avahi build failure was breaking the entire chain (lmcp-* and
claude-his-* depend transitively on it). These jobs only share a runner,
not real build outputs — one failing package should not block the
others.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -12,6 +12,7 @@ on:
 jobs:
   distcc-avahi-aarch64:
     runs-on: arch-aarch64
+    continue-on-error: true
     steps:
       - uses: actions/checkout@v4