Set the base path configuration option using an environment variable

[HCl-not-HCi]

There is a base option in the astro.config.mjs file to configure the base path of the website (e.g. /my-path/ to deploy under example.com/my-path/). In my case, I had to deploy the page in different environments with different paths. Meaning, I have to create a dedicated config file for each path.

First, I expected the possibility to configure the path by using an environment variable (since the base URL gets exported to the import.meta.env.BASE_URL env variable). However, this is not possible.

Therefore, I wish there would be the possiblity to configure the base config option using an environment variable. This could be extended to support other options as well (where it makes sense) to be fully flexible when buidling and deploying a website.

In already started a discussion about this on Discord, but we did not come to a solution:
https://discord.com/channels/830184174198718474/845451724738265138/998514489710358568

[BigglesZX]

For anyone looking for a resolution to this question, it seems to be possible now and is documented here.