try to restore git permissions

It would appear that invent mangles files permissions so that we end up
with world writable files. Instead try to hold on to git. This may
ultimately cause trouble with docker but we'll have to try to know.

Relates to #27

.gitlab-ci.yml

@@ -9,6 +9,9 @@ start:
   allow_failure: false
   image: archlinux:latest
   script:
+    # invent.kde.org seems to mangle permissions, restore them so we have accurate permissions for configs and whatnot
+    # https://stackoverflow.com/questions/2517339/how-to-restore-the-permissions-of-files-and-directories-within-git-if-they-have
+    - git diff -p -R --no-ext-diff --no-color --diff-filter=M | grep -E "^(diff|(old|new) mode)" --color=never | git apply
     - ls -lahR
     - pacman --sync --refresh --noconfirm curl which
     - curl -s https://gitlab.com/gitlab-org/incubation-engineering/mobile-devops/download-secure-files/-/raw/main/installer | bash