Ensure build is present

dschwoerer · dschwoerer · commit 7809e5221d2b · 2026-04-30T07:26:56.000+02:00
diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -3,4 +3,5 @@ ipykernel
 nbsphinx
 matplotlib>=2.2
 sphinx_rtd_theme
-numpy
+numpy
+build
