Vibecoded CI/CD

lean/entrypoint.sh

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+#!/bin/sh
+# Mathew — lean server entrypoint.
+#
+# In the usual image this does nothing: the built Mathlib already sits under
+# the project and the server starts straight away.
+#
+# With the image built as `--build-arg BAKE_MATHLIB=false` (see README's
+# "Keeping Mathlib out of the image"), the project's .lake is meant to be a
+# volume: a fresh one gets filled once, at first start, so Mathlib's ~7GB of
+# compiled cache never travels through the registry.
+set -eu
+
+PROJECT=/opt/lean4web/Projects/MathlibDemo
+
+if [ ! -f "$PROJECT/.lake/build/lib/lean/MathlibDemo.olean" ]; then
+  echo "[mathew-lean] $PROJECT/.lake holds no built Mathlib — fetching it once (expect ~10 minutes)"
+  cd "$PROJECT"
+  # lake update pulls the sources pinned in lake-manifest.json, and Mathlib's
+  # post-update hook fetches the matching precompiled cache; lake build then
+  # only writes the project's own module. The image's pinned toolchain
+  # (elan) stays as it is — no lean-toolchain re-curl, no surprise downloads.
+  lake update -R
+  lake build
+  echo "[mathew-lean] Mathlib ready"
+fi
+
+exec "$@"