Same fix as nas-auth: mode=max takes ~4min and times out on the NAS,
which marks the build as failure and skips deploy. mode=min is fast
and ignore-error keeps the build from failing on cache export.
Mirror the cache infra added to nas-auth (commit a1ecba3):
- Dockerfile: `RUN --mount=type=cache,target=/root/.nuget/packages`
for restore + publish, with syntax 1.6 directive.
- workflow: cache-from/cache-to registry cache mode=max, so buildkit
layer cache survives across CI runs (fresh buildkit per run otherwise).
First run after this still pays full cost; each subsequent run should
drop ~50% off dotnet restore.
Deploy job now cd's into /volume1/docker/compose/obsidian-mcp (exposed
to runner via the new gitea-runner mount) instead of cloning nas-infra
to a temp dir. The clone approach couldn't deploy because .env.shared
is gitignored and only exists on NAS.
zhengchen.tao