try to fix build for rust 2025-06-27

Author: hoodmane

main.sh

@@ -7,4 +7,9 @@ fi
 ./emsdk/emsdk install $1
 ./emsdk/emsdk activate $1
 source ./emsdk/emsdk_env.sh
+
+# Don't tell Rust it's running in CI or it gets mad that:
+# "`llvm.download-ci-llvm` cannot be set to `true` on CI. Use `if-unchanged` instead."
+unset GITHUB_ACTIONS
+
 python3 main.py $@