checkapk: run apk fetch in quiet mode to workaround bug in apk fetch

apk fetch --stdout will mix the progress bar with data output. We work
around this by run it in quiet mode.

checkapk.in

@@ -71,7 +71,7 @@ for i in $pkgname $subpackages; do
 		die "the built package ($_pkgname) is already in the repo"
 	fi
 
-	apk fetch --repositories-file $tmpdir/repositories --stdout $_pkgname \
+	apk fetch --quiet --repositories-file $tmpdir/repositories --stdout $_pkgname \
 		| tar -zt | grep -v '^\.SIGN\.' | sort > filelist-$_pkgname-old \
 		|| die "failed to download old pkg, maybe run 'apk update'?"