docs/devel: teach about KOLET_ARCHES

Building kolet for other arches in the developer case is a waste of time. This should probably be the default in fact. Anyway, for now let's at least document `KOLET_ARCHES` to work around this.
coreos · Feb 14, 2023 · 4a6b256 · 4a6b256
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diff --git a/docs/devel.md b/docs/devel.md
@@ -37,6 +37,9 @@ $ make
 $ sudo make install
 ```
 
+In the local developer case, you usually don't care about building kolet for
+other arches. You can skip building them using e.g. `make KOLET_ARCHES=x86_64`.
+
 From that point on, you only need to run `make && sudo make install` if you're
 hacking on cosa itself (unless there are new RPM requirements added).