ci: chmod go-w ~/.cache before pkg commands (sr.ht cache is group-writable)

ober

5677adad50483d1dba09be701e5f4c03c30458bd

diff --git a/.build.yml b/.build.yml
index abeece5..6a5b8bf 100644
--- a/.build.yml
+++ b/.build.yml
@@ -35,12 +35,13 @@ tasks:
       cd jerboa-emacs
       make security
       J="$HOME/jerboa/dist/jerboa"
+      chmod -R go-w "$HOME/.cache"
       "$J" pkg verify
       "$J" pkg policy
       "$J" pkg build
       "$J" pkg pack --output "$PWD/jerboa-emacs-0.1.0.jpkg"
-      "$J" pkg verify "$PWD/jerboa-emacs-0.1.0.jpkg"
-      "$J" pkg verify --reproduce
+        "$J" pkg verify "$PWD/jerboa-emacs-0.1.0.jpkg"
+        "$J" pkg verify --reproduce
   - build-emacs: |
       cd jerboa-emacs
       JERBUILD_TOOL="$HOME/jerboa/dist/jerbuild" \