feat: add test for read-only localtime

Author: nijel

test-generate

@@ -27,8 +27,12 @@ if [ "$3" = "split" ] ; then
 EOT
   done
 fi
-if [ "$3" = "read-write" ] ; then
+if [ "$3" = "read-write" ] || [ "$3" = "localtime" ] ; then
     sed -i  -e '/tmpfs:/D' -e '/- \/run/D' -e '/- \/tmp/D' -e '/read_only: true/D' docker-compose.yml
+    if [ "$3" = "localtime" ] ; then
+        sed -i -e '/weblate-cache:/a\
+    - /etc/localtime:/etc/localtime:ro' docker-compose.yml
+    fi
 else
     # Allow execution in tmp
     sed -i 's/- \/tmp/- \/tmp:exec/' docker-compose.yml