add calendar extension?

[ragingdave]

I just ran into this where without the calendar extension, functions (such as the one I use, easter_days()) are missing? What's the possibility of having that added?

[lorisleiva]

Hi there 👋

That's a good idea. To be honest I had no idea that we had to manually install them. I'll add this to the pipeline.

Here is a similar PR made for another DockerFile that could help: Monogramm/docker-dolibarr#12.