doc: more info about how to (maybe, someday) precompile mesa shader caches

TODO.md

@@ -49,7 +49,7 @@
   - adding ~/.cache/mesa_shader_cache_db to the sandbox massively improves launch time,
     probably reduces memory use,
     but has unknown data leak implications.
-  - either (1) pre-populate the shader cache somehow
+  - either (1) pre-populate the shader cache somehow, e.g. <https://gitlab.freedesktop.org/mesa/shader-db>
     or (2) use a seperate shader cache per-app
     or (3) disable the mesa cache and see if that actually helps (MESA_SHADER_CACHE_DISABLE=true)
 - sane-deadlines: show day of the week for upcoming items

hosts/common/home/fs.nix

@@ -42,6 +42,8 @@
     #   - where /path/to/txt contains a list of names which represent read-only caches
     #   - allows to change the cache providers w/o having to update variables
     #
+    # see also: <https://gitlab.freedesktop.org/mesa/shader-db>
+    # - database of common shaders (gtk4, chromium, etc) & instructions to compile for any arch
     # see also: <https://github.com/ValveSoftware/Fossilize>
     #   which may help in generating readonly cache files
     #