Improve publish script path resolution

scripts/publish-image.sh

@@ -3,7 +3,12 @@
 set -euo pipefail
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-PROJECT_ROOT="$(cd "${SCRIPT_DIR}/../../.." && pwd)"
+
+if PROJECT_ROOT="$(git -C "${SCRIPT_DIR}" rev-parse --show-toplevel 2>/dev/null)"; then
+    :
+else
+    PROJECT_ROOT="$(cd "${SCRIPT_DIR}/../../.." && pwd)"
+fi
 DOCKER_CONTEXT="${PROJECT_ROOT}/kirby"
 DOCKERFILE_PATH="${DOCKER_CONTEXT}/Dockerfile"