chore(ci): add coverage comment to test workflow

Author: thekaveman

.github/workflows/tests.yml

@@ -3,22 +3,36 @@ name: Tests
 on:
   pull_request:
   push:
+    branches:
+      - "main"
+  workflow_call:
 
 jobs:
   tests:
     name: Tests
     runs-on: ubuntu-latest
+    permissions:
+      # Gives the action the necessary permissions for publishing new
+      # comments in pull requests.
+      pull-requests: write
+      # Gives the action the necessary permissions for pushing data to the
+      # python-coverage-comment-action branch, and for editing existing
+      # comments (to avoid publishing multiple comments in the same PR)
+      contents: write
+
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
+          cache: pip
+          cache-dependency-path: "**/pyproject.toml"
 
       - name: Install dependencies
         run: |
@@ -27,3 +41,11 @@ jobs:
 
       - name: Run tests
         run: ./tests/run.sh
+
+      - name: Coverage comment
+        uses: py-cov-action/python-coverage-comment-action@v3
+        if: github.event_name != 'workflow_call' && matrix.version == '3.11'
+        with:
+          GITHUB_TOKEN: ${{ github.token }}
+          MINIMUM_GREEN: 90
+          MINIMUM_ORANGE: 80