Update Dockerfile

Dockerfile

@@ -27,7 +27,7 @@ COPY . .
 RUN chown -R pptruser:pptruser /usr/src/app
 
 # Create a directory for temporary files with correct permissions
-RUN mkdir -p /tmp/marp-work && chown -R pptruser:pptruser /tmp/marp-work && chmod 755 /tmp/marp-work
+RUN mkdir -p /tmp/marp-work && chown -R pptruser:pptruser /tmp/marp-work && chmod -R 777 /tmp/marp-work
 
 # Run everything after as non-privileged user.
 USER pptruser