Fixup GitHub actions

- pin to ubuntu-20.04 to work around actions/setup-python#544
- switch to setup-python@v4
- only build wheels and attempt to publish on release

Author: theacodes

.github/workflows/nox-test.yaml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   lint:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     name: Lint
     steps:
       - uses: actions/checkout@v3
@@ -17,10 +17,9 @@ jobs:
         run: git submodule update --init --recursive
 
       - name: Setup python
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: '3.11'
-          architecture: x64
 
       - name: Setup virtualenv
         run: |
@@ -34,7 +33,7 @@ jobs:
           noxenv/bin/nox
 
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
@@ -48,10 +47,9 @@ jobs:
         run: git submodule update --init --recursive
 
       - name: Setup python
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
-          architecture: x64
 
       - name: Setup virtualenv
         run: |

.github/workflows/pypi-publish.yml

@@ -6,9 +6,6 @@ name: Build Wheels
 on:
   release:
     types: [created, edited]
-  push:
-  pull_request:
-    types: [opened, reopened, edited, synchronize]
 
 jobs:
   build_wheels:
@@ -30,7 +27,7 @@ jobs:
           repository: github/cmark-gfm
           path: cmark-gfm
 
-      - uses: actions/setup-python@v3
+      - uses: actions/setup-python@v4
         name: Install Python
         with:
           python-version: '3.11'