Update github, tox, and RTD configs

Improve CI build matrices.
Drop docs from github CI build. We'll use the readthedocs CI to
build on pull requests

.github/workflows/build.yaml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
         with:
-          python-version: 3.7
+          python-version: "3.10"
       - name: test
         run: |
           python setup.py sdist
@@ -25,6 +25,7 @@ jobs:
           cd "nose2-${version}"
           pip install -e '.[dev]'
           nose2 -v --pretty-assert
+
   test:
     strategy:
       fail-fast: false
@@ -53,15 +54,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: install tox
         run: python -m pip install -U tox
-      - name: lint
-        run: python -m tox -e lint
-        # only lint on linux py3 box for faster overall builds
-        if: ${{ matrix.python-version == '3.10' && matrix.os == 'ubuntu-latest' }}
       - name: test
         run: python -m tox -e py
         # FIXME: ignore errors in windows builds (for now)
         continue-on-error: ${{ matrix.os == 'windows-latest' }}
-      - name: ensure docs build
-        # docs are only ever built on a linux py3 box (readthedocs)
-        if: ${{ matrix.python-version == '3.10' && matrix.os == 'ubuntu-latest' }}
-        run: python -m tox -e docs

.readthedocs.yml

@@ -0,0 +1,16 @@
+version: 2
+
+sphinx:
+  configuration: docs/conf.py
+
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3.10"
+
+python:
+  install:
+    - method: pip
+      path: .
+      extra_requirements:
+        - dev

tox.ini

@@ -15,7 +15,6 @@ skip_install = true
 commands = pre-commit run --all-files
 
 [testenv:docs]
-basepython=python2.7
 extras = dev
 changedir=docs
 commands=sphinx-build -b html -d {envtmpdir}/doctrees . {envtmpdir}/html