Add Python 3.10 to GitHub Actions workflows

Beta releases of Python 3.10 were installed with `"3.10.0-beta - 3.10"`.
Python 3.10 is now stable, so beta versions are no longer needed.

Python versions in YAML must now be quoted. `3.10` is interpreted as a
float and becomes `3.1`, so `"3.10"` must be used instead.

.github/workflows/builds.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9]
+        python-version: ["3.8", "3.9", "3.10"]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
@@ -67,12 +67,13 @@ jobs:
       - name: Run unit tests
         run: poetry run pytest --cov-report=xml
       - name: Upload test coverage report to Codecov
+        if: matrix.python-version == '3.10'
         uses: codecov/codecov-action@v2
         with:
           fail_ci_if_error: true
           flags: unit
       - name: Build Python package with latest Python version and publish to PyPI
-        if: startsWith(github.ref, 'refs/tags/') && matrix.python-version == 3.9
+        if: startsWith(github.ref, 'refs/tags/') && matrix.python-version == '3.10'
         run: |
           PACKAGE_VERSION=$(poetry version -s)
           GIT_TAG_VERSION=$(echo ${{ github.ref }} | cut -d / -f 3)
@@ -91,7 +92,7 @@ jobs:
       fail-fast: false
       matrix:
         linux-version: ["", "alpine", "slim"]
-        python-version: [3.8, 3.9]
+        python-version: ["3.8", "3.9", "3.10"]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
@@ -231,7 +232,7 @@ jobs:
             -u ${{ github.actor }} --password-stdin
       - name: Tag and push Docker images with latest tags
         if: >
-          matrix.python-version == 3.9 &&
+          matrix.python-version == '3.10' &&
           (
             startsWith(github.ref, 'refs/tags/') ||
             github.ref == 'refs/heads/develop' ||

.github/workflows/codeql.yml

@@ -24,7 +24,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
         with:
-          python-version: "3.9"
+          python-version: "3.10"
       - name: Set up Poetry cache for Python dependencies
         uses: actions/cache@v2
         with:

.github/workflows/hooks.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9]
+        python-version: ["3.8", "3.9", "3.10"]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2

.github/workflows/tests.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9]
+        python-version: ["3.8", "3.9", "3.10"]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
@@ -62,6 +62,7 @@ jobs:
       - name: Run unit tests
         run: poetry run pytest --cov-report=xml
       - name: Upload test coverage report to Codecov
+        if: matrix.python-version == '3.10'
         uses: codecov/codecov-action@v2
         with:
           fail_ci_if_error: true