feat: Create CACHEDIR.TAG file

[pavelzw]

Closes #1904

alternatively, we could also create the CACHEDIR.TAG file in .pixi/envs. I don't have strong opinions on this. Backup tools might not catch .pixi/config.toml in this implementation but .gitignore also doesn't in the default configuration.

---

https://github.com/prefix-dev/pixi/issues/1904#issuecomment-2311743087

Should we then maybe break currents standards by moving the config.toml to a seperate config folder, and exclude that folder?

@tdejager tbh i would be in favor of that, the current way is a bit unintuitive imo

[wolfv]

I think there is something similar happening in rattler right now cc @prsabahrami

[ruben-arts]

FYI: https://github.com/conda/rattler/pull/1155

[baszalmstra]

@prsabahrami would you be able to check this PR and see if this is something you think we should do either here or in rattler?

[pavelzw]

@ruben-arts @Hofer-Julian @lucascolley how should we follow-up with this PR? Should i rebase main?

[ruben-arts]

@pavelzw I think that would be the way forward right now.

[ruben-arts]

I believe we're good on this one, I'll close it.

[pavelzw]

I believe we're good on this one

i dont think so @ruben-arts. this was created with the latest pixi from main.

❯ ls -lah
total 40
drwx------@     7 pavel  staff   224B Nov 21 15:22 ./
drwx------@ 10220 pavel  staff   319K Nov 21 15:22 ../
-rw-r--r--@     1 pavel  staff   128B Nov 21 15:22 .gitattributes
-rw-r--r--@     1 pavel  staff    47B Nov 21 15:22 .gitignore
drwxr-xr-x@     5 pavel  staff   160B Nov 21 15:22 .pixi/
-rw-r--r--@     1 pavel  staff   7.6K Nov 21 15:22 pixi.lock
-rw-r--r--@     1 pavel  staff   270B Nov 21 15:22 pixi.toml
❯ ls -lah .pixi
total 16
drwxr-xr-x@ 5 pavel  staff   160B Nov 21 15:22 ./
drwx------@ 7 pavel  staff   224B Nov 21 15:22 ../
-rw-r--r--@ 1 pavel  staff    25B Nov 21 15:22 .condapackageignore
-rw-r--r--@ 1 pavel  staff    15B Nov 21 15:22 .gitignore
drwxr-xr-x@ 3 pavel  staff    96B Nov 21 15:22 envs/
❯ ls -lah .pixi/envs
total 0
drwxr-xr-x@ 3 pavel  staff    96B Nov 21 15:22 ./
drwxr-xr-x@ 5 pavel  staff   160B Nov 21 15:22 ../
drwxr-xr-x@ 9 pavel  staff   288B Nov 21 15:22 default/

also, i can't find a CACHEDIR.TAG in ~/Library/Caches/rattler.

can you please reopen this pr? then i'll rebase it and put CACHEDiR.TAG in .pixi/envs