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

ober

bceb6210d3e1cf407305aea33498190d3af7a7b4

diff --git a/.builds/ci.yml b/.builds/ci.yml
index d1c0eac..e482280 100644
--- a/.builds/ci.yml
+++ b/.builds/ci.yml
@@ -32,6 +32,7 @@ tasks:
     make jerboa CHEZ_CONFIGURE_EXTRA=--disable-x11 JERBOA_NATIVE_FEATURES=tls JERBOA_CC_OPT=-O0
     echo 'export PATH="$HOME/jerboa/dist:$PATH"' >> ~/.buildenv
 - package: |
+    umask 022
     cd jerboa-fuse
     J="$HOME/jerboa/dist/jerboa"
     mkdir -p "$HOME/.cache" && chmod -R go-w "$HOME/.cache"
@@ -42,5 +43,6 @@ tasks:
     "$J" pkg verify "$PWD/jerboa-fuse-0.1.0.jpkg"
     "$J" pkg verify --reproduce
 - verify: |
+    umask 022
     cd jerboa-fuse
     PATH="$HOME/jerboa/dist:$PATH" JERBUILD="$HOME/jerboa/dist/jerbuild" make verify