add banner for administrations / usagers

app/views/layouts/_pre_maintenance.html.haml

@@ -2,3 +2,13 @@
   .site-banner.warning
     .container
       = sanitize(ENV['BANNER_MESSAGE'])
+
+- if ENV['ADMINISTRATION_BANNER_MESSAGE'].present? && instructeur_signed_in?
+  .site-banner.warning
+    .container
+      = sanitize(ENV['ADMINISTRATION_BANNER_MESSAGE'])
+
+- if ENV['USAGER_BANNER_MESSAGE'].present? && !instructeur_signed_in?
+  .site-banner.warning
+    .container
+      = sanitize(ENV['USAGER_BANNER_MESSAGE'])

config/env.example.optional

@@ -188,3 +188,11 @@ SMTP_AUTHENTICATION="plain"
 SENDMAIL_ENABLED="disabled"
 SENDMAIL_LOCATION="/usr/sbin/sendmail"
 SENDMAIL_ARGUMENTS="-i"
+
+# Various banner for important messages
+# for all users
+BANNER_MESSAGE=""
+# for instructeurs and admins only
+ADMINISTRATION_BANNER_MESSAGE=""
+# for usager only
+USAGER_BANNER_MESSAGE=""