CI: Add install to none and full tests

Author: effigies

tox.ini

@@ -15,6 +15,7 @@ envlist =
   py3{9,10,11}-pre-{x86,x64}
   # x64-only range
   py312-{full,pre}-x64
+  install
   doctest
   style
   typecheck
@@ -31,9 +32,9 @@ python =
 
 [gh-actions:env]
 DEPENDS =
-  none: none
+  none: none, install
   pre: pre
-  full: full
+  full: full, install
   min: min
 
 ARCH =