diff --git a/Dockerfile.linux.amd64 b/Dockerfile.linux.amd64
index 8133ef4..f55168f 100644
--- a/Dockerfile.linux.amd64
+++ b/Dockerfile.linux.amd64
@@ -1,5 +1,9 @@
 FROM cr.simoncor.net/siempie/hugo-sws:latest
 
+# build cache date argument trick
+ARG GITEA_SHA=some_sha
+RUN echo $GITEA_SHA
+
 # clone site and template
 RUN set -e \
       && git clone https://git.simoncor.net/siempie/start.simoncor.net.git /site \