[DH-317] Install quarto in Dev hub (dashboard image)

[balajialg]

So that Sophie can explore quarto dashboards in Dev hub

[ryanlovett]

I recommend not using R code to script the installation of quarto. I also think this method will fail because I believe the user running install.R in repo2docker doesn't have root privileges. I believed this passed CI because it is the secondary image and hubploy doesn't build secondary images.

repo2docker doesn't make quarto installation easy because quarto is not in Ubuntu jammy repos nor is it in conda-forge.
Upstream's example at https://github.com/cwickham/binder-example/ installs into ~/.local/bin, but ~ gets displaced by users' hub storage.

So either we have to use a Dockerfile, like what stat20 uses, or we have to find a way to seed content for repo2docker's appendix. That can run commands as root.

Lastly, it'd probably worth creating an issue to request that quarto be installed (along with RStudio, shiny, etc.) in repo2docker's R build packs.

[ryanlovett]

Actually, there is a quarto package in conda, https://anaconda.org/conda-forge/quarto. So it should just go into the environment.yml.

[balajialg]

Thanks @ryanlovett for the suggestion. I just made a commit which added the quarto package to the environment.yml file. That seems to be a simple process to enable quarto. Good to know!

[ryanlovett]

I was wondering about this since it is technically correct, but hasn't been a problem. This script is evidently passed to R rather than made executable and run directly. The upstream example doesn't even have a hashbang.

[balajialg]

@ryanlovett I will merge the PR for now. Will fix it if there are issues.