feat: expand logger with subshell-safe error handling

misc/alpine-install.func

@@ -32,6 +32,7 @@ error_handler() {
   local exit_code="$?"
   local line_number="$1"
   local command="$2"
+  log_error "line $line_number: exit code $exit_code while executing command $command"
   local error_message="${RD}[ERROR]${CL} in line ${RD}$line_number${CL}: exit code ${RD}$exit_code${CL}: while executing command ${YW}$command${CL}"
   echo -e "\n$error_message\n"
 }