Run seperate typeguard job (because it is much slower)

.github/workflows/typeguard.yml

@@ -0,0 +1,18 @@
+name: typeguard
+
+on:
+  - push
+
+jobs:
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: "3.10"
+    - name: Install dependencies
+      run: pip install nox
+    - name: Test with nox
+      run: nox -e pytest_typeguard

noxfile.py

@@ -4,17 +4,16 @@
 @nox.session(python=["3.7", "3.8", "3.9", "3.10"])
 @nox.parametrize("all_deps", [True, False])
 def pytest(session, all_deps):
-    if all_deps:
-        session.install(".[testing,other]")
-    else:
-        session.install(".[testing]")
-
+    session.install(".[testing,other]" if all_deps else ".[testing]")
     session.run("coverage", "erase")
+    session.run("pytest")
+
 
-    if session.python == "3.10":
-        session.run("pytest", "--typeguard-packages=adaptive")
-    else:
-        session.run("pytest")
+@nox.session(python="3.10")
+def pytest_typeguard(session):
+    session.install(".[testing,other]")
+    session.run("coverage", "erase")
+    session.run("pytest", "--typeguard-packages=adaptive")
 
 
 @nox.session(python="3.7")