misc: give user more build permissions to make tmp files

Dockerfile

@@ -10,7 +10,8 @@ ENV HOME=/home/user \
 # Create and set up app directory with proper permissions
 WORKDIR $HOME/app
 RUN mkdir -p $HOME/app && \
-    chown -R user:user $HOME/app
+    chown -R user:user $HOME/app && \
+    chmod -R 755 $HOME/app
 
 # Switch to the user
 USER user
@@ -24,6 +25,9 @@ RUN npm install
 # Copy the entire viewer directory
 COPY --chown=user viewer/ .
 
+# Ensure write permissions for build process
+RUN chmod -R 755 .
+
 # Build the application
 RUN npm run build