Fix setting workdir too late

Dockerfile

@@ -208,6 +208,7 @@ COPY misc/afk_manager.cfg ${SERVER_DIR}/tf/cfg/sourcemod/
 COPY misc/custom_whitelist_11769.txt ${SERVER_DIR}/tf/cfg/
 COPY misc/afk_manager.phrases.txt ${SERVER_DIR}/tf/addons/sourcemod/translations/
 
+WORKDIR ${SERVER_DIR}
 COPY --chmod=755 utils/entrypoint.sh .
 COPY utils/healthcheck.sh .
 
@@ -221,8 +222,6 @@ ENV STV_TITLE="A Team Fortress 2 server Source TV"
 ENV STV_PASSWORD=""
 ENV DOWNLOAD_URL="https://fastdl.serveme.tf/"
 
-WORKDIR ${SERVER_DIR}
-
 ENTRYPOINT ["./entrypoint.sh"]
 CMD ["+sv_pure","2","+map","cp_snakewater_final1","+maxplayers","8"]