Fail quickly if not in git repository in scripts/version

scripts/version

@@ -1,7 +1,9 @@
 #!/bin/sh
 set -eu
 
-cd "$(dirname "$0")"
+cd "$(dirname "$0")/../"
+test -d .git || exit 1
+
 if git describe --tags --match 'jq-*' >/dev/null 2>&1; then
   git describe --tags --match 'jq-*' --dirty | sed 's/^jq-//'
 else