Add Github CI config.

.github/dependabot.yml

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+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      # Check for updates on Sunday, 8PM UTC
+      interval: "weekly"
+      day: "sunday"
+      time: "20:00"
+
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      # Check for updates on Sunday, 8PM UTC
+      interval: "weekly"
+      day: "sunday"
+      time: "20:00"

.github/workflows/ci.yml

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+name: CI
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+# Cancel active CI runs for a PR before starting another run
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+defaults:
+  run:
+    shell: bash  # https://github.com/beeware/briefcase/pull/912
+
+env:
+  FORCE_COLOR: "1"
+
+jobs:
+  pre-commit:
+    name: Pre-commit checks
+    uses: beeware/.github/.github/workflows/pre-commit-run.yml@main
+
+  unit-tests:
+    name: Unit tests
+    needs: [ pre-commit ]
+    runs-on: ${{ matrix.platform }}
+    continue-on-error: ${{ matrix.experimental || false }}
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [ "macos-13", "macos-latest", "windows-latest", "ubuntu-24.04" ]
+        python-version: [ "3.9", "3.13", ]
+        include:
+          # Ensure the Python versions between min and max are tested
+          - platform: "ubuntu-24.04"
+            python-version: "3.10"
+          - platform: "ubuntu-24.04"
+            python-version: "3.11"
+          - platform: "ubuntu-24.04"
+            python-version: "3.12"
+          # Allow dev Python to fail without failing entire job
+          - platform: "ubuntu-24.04"
+            python-version: "3.14"
+            experimental: true
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4.2.2
+      with:
+        fetch-depth: 0
+
+    - name: Set up Python
+      uses: actions/setup-python@v5.4.0
+      with:
+        python-version: ${{ matrix.python-version }}
+        allow-prereleases: true
+
+    - name: Install Tox
+      uses: beeware/.github/.github/actions/install-requirement@main
+      with:
+        requirements: tox
+        extra: dev
+
+    - name: Test
+      id: test
+      run: |
+        tox -e py

.github/workflows/config-file-deps-bump.yml

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+name: Bump Config File Dependencies
+
+on:
+  schedule:
+    - cron: "0 20 * * SUN"  # Sunday @ 2000 UTC
+  workflow_dispatch:
+
+jobs:
+  dep-bump-versions:
+    name: Bump Config File Dependencies
+    uses: beeware/.github/.github/workflows/dep-version-bump.yml@main
+    secrets: inherit

.github/workflows/pre-commit-update.yml

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+name: Update pre-commit
+
+on:
+  schedule:
+    - cron: "0 20 * * SUN"  # Sunday @ 2000 UTC
+  workflow_dispatch:
+
+jobs:
+  pre-commit-update:
+    name: Update pre-commit
+    uses: beeware/.github/.github/workflows/pre-commit-update.yml@main
+    secrets: inherit