refactor: logs on stderr

{{cookiecutter.project_slug}}/templates/gitlab-ci-{{cookiecutter.project_slug}}.yml

@@ -128,15 +128,15 @@ stages:
   set -e
 
   function log_info() {
-      echo -e "[\\e[1;94mINFO\\e[0m] $*"
+    >&2 echo -e "[\\e[1;94mINFO\\e[0m] $*"
   }
 
   function log_warn() {
-      echo -e "[\\e[1;93mWARN\\e[0m] $*"
+    >&2 echo -e "[\\e[1;93mWARN\\e[0m] $*"
   }
 
   function log_error() {
-      echo -e "[\\e[1;91mERROR\\e[0m] $*"
+    >&2 echo -e "[\\e[1;91mERROR\\e[0m] $*"
   }
 
   function fail() {