ci: Adds debug info to CI build

Adds `ls` command to inspect the contents of the musl toolchain directory for debugging purposes in the CI environment. This aids in diagnosing potential build issues related to toolchain availability.

Jenkinsfile

@@ -32,6 +32,7 @@ pipeline {
 							sh '''
 								export CARGO_HOME="$(pwd)/.cargo"
 								export PATH="$(pwd)/.local/bin:${PATH}"
+								ls -l /usr/local/musl/bin
 								clang -v
 								gcc -v
 								cargo -V