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

ober

b2ddab8ba72f094837aef0d87c4f3b2d8db06913

diff --git a/.builds/ci.yml b/.builds/ci.yml
index d55367f..1071b59 100644
--- a/.builds/ci.yml
+++ b/.builds/ci.yml
@@ -30,6 +30,7 @@ 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-awk
     J="$HOME/jerboa/dist/jerboa"
     mkdir -p "$HOME/.cache" && chmod -R go-w "$HOME/.cache"
@@ -40,5 +41,6 @@ tasks:
     "$J" pkg verify "$PWD/jerboa-awk-0.1.0.jpkg"
     "$J" pkg verify --reproduce
 - verify: |
+    umask 022
     cd jerboa-awk
     PATH="$HOME/jerboa/dist:$PATH" JERBUILD="$HOME/jerboa/dist/jerbuild" make verify