I am fighting with the same issue on regular server. I found one issue that is compatibility. strapi 4.0.3 installation does not failed on npm or node version but 4.0.0 simply fails. You have to have npm 6 and node 14 but even when I have I am not able to finish installation.
What other headless CMS have you chosen? I burned already 2 days and I need to move on for something that works…