This PR was authored by Mux, an AI coding agent, acting on Mike's behalf.

Summary

Add /home/coder/.mux/src to the dogfood mise trusted_config_paths defaults so mise configs in Mux-managed worktrees are trusted out of the box.

Background

Mux creates a fresh worktree per workspace under ~/.mux/src/<project>/<branch>. For repos that ship a mise.toml (like this one), every fresh worktree is an untrusted mise config directory:

• With a TTY, any mise shim or mise exec (e.g. make lint targets) blocks forever on the interactive mise trust prompt. When output is captured, the prompt is invisible and looks like a deadlock.
• Without a TTY, it fails with Config files ... are not trusted.

Either way, each new worktree needs a manual mise trust before builds work.

Implementation

The trust list is defined in three places that must stay in lockstep: the /etc/mise/conf.d/00-coder-trust.toml fallback baked into both Dockerfile.base images, and the user-owned ~/.config/mise/conf.d/00-coder-trust.toml seeded by the install-deps script in main.tf (mise does not merge trusted_config_paths across config layers). All three get the new path.

For home volumes that already have the seeded trust file, install-deps now backfills the Mux path into the existing trusted_config_paths array (guarded by a grep so it runs once). The backfill only matches the seeded multi-line layout; files reshaped by the user are left untouched.

Validation

Verified on a dogfood workspace: with /home/coder/.mux/src in trusted_config_paths, a fresh directory under ~/.mux/src/coder/ containing this repo's mise.toml reports trusted from mise trust --show, and a mise shim invocation under a PTY that previously hung on the trust prompt returns immediately.

The trust-file block was extracted from the template (with the heredoc indent stripped, matching the rendered script) and executed against three fixtures: a pre-change seeded file (backfill inserts the path once, idempotent on re-run), a missing file (seeds the new default list), and a user-reshaped single-line file (left unmodified).

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