To manually install a theme plugin for Redmine in a Docker container on your Synology NAS, place the theme folder in the /usr/src/redmine/plugins directory. You can use commands like git clone to download the theme directly into this folder. After setting appropriate permissions and restarting the Redmine container, activate the theme through the Admin area under "Settings" > "Appearance."
Block Blast

I recommend recommend cloning their repo directly RUN git clone githubredmine-theme-gitmike.git public/themes/gitmike . The line will save the cloned project in the appropriate folder public/themes smashy road

@block blast I suggest cloning their repository directly with the command: RUN git clone githubredmine-theme-gitmike.git public/themes/gitmike .

但是不知道 Geometry Dash 外掛程式該放置哪一路徑資料夾?該如何進行手動安裝?

要在 Synology NAS Docker 上安装 Redmine 主题：解压缩主题并将主题文件夹放在 Redmine crossy road unblocked 容器中。 重新启动容器以应用新主题。
然后您可以在管理界面中选择主题。