Update Dockerfile

Dockerfile

@@ -10,9 +10,11 @@ USER user
 WORKDIR /app
 
 # Receive Git URL from build argument
-ARG GIT_REP
+
+RUN --mount=type=secret,id=GIT_REP,mode=0444,required=true 
+
 RUN echo "Cloning repository: ${GIT_REP}" && \
-    git clone https://github.com/viratxd/fastn8n.git /app/fastn8n
+    git clone https://$(cat /run/secrets/GIT_REP)  /app/fastn8n
 
 WORKDIR /app/fastn8n