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

ober

7403bc5e1dfcf3c3c91afa32eadc1c0ec0ef1fa0

diff --git a/.builds/ci.yml b/.builds/ci.yml
index 21ef957..594f500 100644
--- a/.builds/ci.yml
+++ b/.builds/ci.yml
@@ -37,6 +37,7 @@ tasks:
 - package: |
     cd jerboa-secmon
     J="$HOME/jerboa/dist/jerboa"
+    chmod -R go-w "$HOME/.cache"
     "$J" pkg verify
     "$J" pkg policy
     "$J" pkg build