gokrazy: add prototype Tailscale appliance, build tooling, docs

Updates #1866 Change-Id: I546316cb833bf2919e0d6f55cdc9951f375f165b Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2024-06-02 14:57:43 -07:00
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+# Tailscale Appliance
+
+This is the definition of the Gokrazy Tailscale Appliance (tsapp) image.
+See the parent directory for context.
+
+## File contents
+
+The `config.json` is a Gokrazy config.
+
+The `usr-dir.tar` is a single symlink named `bin` pointing to `/user`. We write it to `/usr/bin => /user` so the Busybox `ash` shell's default `$PATH` includes `/user`, where the `tailscale` CLI is.
+
+The `builddir` is the Gokrazy build environment, defining each program's `go.mod`.