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

ober

776e74b241cea2b06f3f8f143eb8b08bd2aca7f9

diff --git a/.build.yml b/.build.yml
index 71a1672..668f258 100644
--- a/.build.yml
+++ b/.build.yml
@@ -44,12 +44,13 @@ tasks:
   - package-code: |
       cd jerboa-code
       J="$HOME/jerboa/dist/jerboa"
+      chmod -R go-w "$HOME/.cache"
       "$J" pkg verify
       "$J" pkg policy
       "$J" pkg build
       "$J" pkg pack --output "$PWD/jerboa-code-0.1.0.jpkg"
-      "$J" pkg verify "$PWD/jerboa-code-0.1.0.jpkg"
-      "$J" pkg verify --reproduce
+        "$J" pkg verify "$PWD/jerboa-code-0.1.0.jpkg"
+        "$J" pkg verify --reproduce
   - vendor-code: |
       cd jerboa-code
       make vendor-deps