Fix REPO_DIR assignment in build.sh to use relative path for improved portability

scripts/build.sh

@@ -2,7 +2,7 @@
 
 set -e
 
-REPO_DIR="$(git rev-parse --show-toplevel)"
+REPO_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 
 if command -v container 2>/dev/null; then
     container build -t "registry.koszewscy.waw.pl/openldap:latest" "$REPO_DIR"