Calendars don't display

[yannloosli]

Describe the bug

Calendars don't display.

I have found the following errors / relevant messages:

• in the nginx log:
  "PROPFIND /dav/agenda/workspace/1/ HTTP/2.0" 500 21 "https://[domain.domain]/assets/_caldavzap/index.tracim.html" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36"
• in the tracim-caldav log:
  --- no python application found, check your startup logs for errors ---
• in console:
  TLM STATUS: error tracim.main.optimized.js?token=86f2050b43ba4b79840403d3500a4f03:2 GLOBAL_dispatchEvent TracimLiveMessageStatusChanged {status: 'error', code: -1}

Context

• Hardware: VPS bought online

• YunoHost version: 11.0.9.15

• I have access to my server: Through SSH | through the webadmin | ...*

• Are you in a special context or did you perform some particular tweaking on your YunoHost instance?: no

• Using, or trying to install package version/branch: master

Steps to reproduce

just open tracim and try to open a calendar.

Expected behavior

Calendar should display...

[yannloosli]

I've alo noticed that live events seems globally broken.
Requests seem to reach the server but answers does not reach the web client.

[yannloosli]

After some more digging, I think a service is missing : pushpin which is the one Tracim rely on to manage live message.

https://github.com/tracim/tracim/blob/develop/doc/PRODUCTION.md