don't error on mkdir tmp

Dockerfile

@@ -18,7 +18,7 @@ RUN wget --quiet https://github.com/duckdb/duckdb/releases/download/v0.9.2/duckd
     unzip duckdb_cli-linux-aarch64.zip && chmod +x duckdb && mv duckdb /usr/local/bin
 
 USER user
-RUN mkdir $TMPDIR
+RUN mkdir -p $TMPDIR # useless since /tmp already exists, but haha how could I know
 RUN yarn && yarn build
 
 # COPY --chown=user ./dist $HOME/app