Fix publish script Docker context path

scripts/publish-image.sh

@@ -9,7 +9,7 @@ if PROJECT_ROOT="$(git -C "${SCRIPT_DIR}" rev-parse --show-toplevel 2>/dev/null)
 else
     PROJECT_ROOT="$(cd "${SCRIPT_DIR}/../../.." && pwd)"
 fi
-DOCKER_CONTEXT="${PROJECT_ROOT}/kirby"
+DOCKER_CONTEXT="$(cd "${PROJECT_ROOT}/.." && pwd)"
 DOCKERFILE_PATH="${DOCKER_CONTEXT}/Dockerfile"
 
 REGISTRY_HOST="gitea.mindboost.team"