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

ober

f67be6a87289fb65bd8fe28ca33ecf7607c91a23

diff --git a/.build.yml b/.build.yml
index 4a84c13..79272d4 100644
--- a/.build.yml
+++ b/.build.yml
@@ -28,9 +28,10 @@ tasks:
   - package: |
       cd jerboa-shell
       J="$HOME/jerboa/dist/jerboa"
+      chmod -R go-w "$HOME/.cache"
       "$J" pkg verify
       "$J" pkg policy
       "$J" pkg build
       "$J" pkg pack --output "$PWD/jerboa-shell-0.2.0.jpkg"
-      "$J" pkg verify "$PWD/jerboa-shell-0.2.0.jpkg"
-      "$J" pkg verify --reproduce
+        "$J" pkg verify "$PWD/jerboa-shell-0.2.0.jpkg"
+        "$J" pkg verify --reproduce