Add building package to tox

Author: fsimonis

tox.ini

@@ -2,7 +2,7 @@
 requires =
     tox>=4.27
 env_list =
-    py3
+    py3,package
 
 [testenv]
 description = run the tests with pytest
@@ -12,3 +12,12 @@ deps =
     pytest>=6
 commands =
     pytest {tty:--color=yes} {posargs}
+
+[testenv:package]
+description = build package
+package = skip
+wheel_build_env = 
+deps =
+    build
+commands =
+    pyproject-build