Fixes for install from source doc
I've followed https://framagit.org/framasoft/joinmobilizon/documentation/-/blob/main/docs/administration/install/source.md?ref_type=heads and found tow errors in the logs, these can be fixed easily :
[error] Could not warm up static assets: could not find static manifest at "/opt/mobilizon/_build/prod/lib/mobilizon/priv/static/cache_manifest.json". Run "mix phx.digest" after building your static files or remove the "cache_static_manifest" configuration from your config files.
This one can be fixed with MIX_ENV=prod mix phx.digest
ref https://framagit.org/framasoft/mobilizon/-/blob/main/.gitlab-ci.yml#L302 & https://hexdocs.pm/phoenix/1.4.0-rc.1/deployment.html
(File.Error) could not write to file \"/var/lib/mobilizon/sitemap/sitemap-00001.xml\": no such file or directory
Fixed by mkdir /var/lib/mobilizon/sitemap
.
Should these infos be added to the doc ? Do you want a PR for that ?