fix: clean the message file

Fixes #3

leaf

@@ -24,6 +24,7 @@ export TESTSUITEFLAGS="-j${PARALLEL_JOBS}"
 export LANG=C
 export LC_CTYPE=C.UTF-8
 export leaf_flags="CFLAGS CXXFLAGS FCFLAGS FFLAGS RUSTFLAGS"
+export LEAF_MESSAGE_DIR="${TEMP_DIR:-/tmp}/leaf-messages"
 for flag in ${leaf_flags}; do
   export $flag
 done
@@ -355,7 +356,7 @@ EOF
 
 leaf_message_init() {
   # one log per package invocation
-  local d="${TEMP_DIR}/leaf-messages/${PKG_PREFIX}/${PKG_NAME}"
+  local d="${LEAF_MESSAGE_DIR}/${PKG_PREFIX}/${PKG_NAME}"
   install -dm755 -- "$d"
   LEAF_MESSAGE_FILE="${d}/messages.$$.$(date +%Y%m%d%H%M%S).log"
   : > "${LEAF_MESSAGE_FILE}"
@@ -392,9 +393,10 @@ leaf_print_message() {
 
     echo -e "\n${PURPLE_COLOR}* Message from ${prefix}/${name}${CLEAR_COLOR}\n"
     cat -- "$f"
-    rm -f -- "$f"
   done
 
+  rm -rf -- "${LEAF_MESSAGE_DIR}"/*
+
   LEAF_MESSAGE_FILES=()
   unset LEAF_MESSAGE_FILE
 }