Add Nox session to do a build

Author: namurphy

noxfile.py

@@ -8,8 +8,15 @@
 nox.options.default_venv_backend = "uv|virtualenv"
 
 
+@nox.session
+def build(session):
+    session.install("uv")
+    session.run("uvx", "--from=mystmd", "myst", "build", "--all")
+
+
 @nox.session
 def lint(session):
+    session.install("uv")
     session.run("uvx", "pre-commit", "run","--all-files")