ci: set umask 022 in package/verify tasks too (jerbuild creates group-writable cache dirs during pkg operations)

ober

f7d6d59366aaef937ed20f18ef6b31e5fee4e2ae

diff --git a/.build.yml b/.build.yml
index 1d8267a..0efdde1 100644
--- a/.build.yml
+++ b/.build.yml
@@ -68,6 +68,7 @@ tasks:
       jerbuild --version
       jerbuild --jerboa-home >/dev/null   # extract the bundled stdlib into the cache
   - package: |
+      umask 022
       cd jerboa-browser
       J="$HOME/jerboa/bin/jerboa"
       mkdir -p "$HOME/.cache" && chmod -R go-w "$HOME/.cache"