github actions: Make coverage check conditional

It does not work on Python 3.5, so we only run coverage checks on newer
Python builds.

.github/workflows/main.yml

@@ -1,5 +1,17 @@
 name: Pre-merge and post-merge tests
 
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+    inputs:
+      skip-coverage:
+        # lcov won't work in Python 3.5.
+        description: "Whether to skip coverage checks?"
+        type: boolean
+        required: false
+        default: false
+
 permissions:
   contents: read
 
@@ -31,11 +43,11 @@ jobs:
         include:
         - python: "3.5"
           platform: ubuntu-20.04
-        - python: "3.12"
-          platform: ubuntu-latest
+          skip-coverage: true
     with:
       python-version: ${{ matrix.python }}
       platform: ${{ matrix.platform }}
+      skip-coverage: ${{ matrix.skip-coverage || false }}
 
   check:  # This job does nothing and is only used for the branch protection
     # https://wildwolf.name/github-actions-how-to-avoid-running-the-same-workflow-multiple-times/

.github/workflows/test.yml

@@ -9,6 +9,10 @@ on:
       platform:
         type: string
         required: true
+      skip-coverage:
+        type: boolean
+        required: false
+        default: false
 
 permissions:
   contents: read
@@ -44,19 +48,29 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install flake8 pytest coverage coverage-lcov toml pint
+          pip install flake8 pytest coverage toml pint
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+      - name: Install coverage-lcov
+        if: "! inputs.skip-coverage"
+        run: |
+          pip install coverage-lcov
       - name: Lint with flake8
         run: |
           # stop the build if there are Python syntax errors or undefined names
           flake8 .  --count --select=E9,F63,F7,F82 --show-source --statistics
           # exit-zero treats all errors as warnings.
           flake8 .  --count --exit-zero --max-complexity=10 --statistics
-      - name: Test with py.test
+      - name: Test with py.test (with coverage)
+        if: "! inputs.skip-coverage"
         run: |
           coverage run -m pytest
           coverage-lcov
+      - name: Test with py.test (without lcov coverage)
+        if: "inputs.skip-coverage"
+        run: |
+          python -m pytest --cov=aioax25 --cov-report=term-missing
       - name: Coveralls
+        if: "! inputs.skip-coverage"
         uses: coverallsapp/github-action@master
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}