Add Github Actions

.github/CODEOWNERS

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+@n-bernat

.github/workflows/flutter_tests_beta.yaml

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+# flutter_tests_*.yaml actions are duplicated, because GitHub doesn't support badges for matrix builds.
+name: app_preferences - Tests (beta)
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - master
+  schedule:
+    - cron: "0 0 * * 0"
+
+jobs:
+  build:
+    timeout-minutes: 5
+    name: Flutter tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: "beta"
+
+      - name: Print version
+        run: flutter --version
+
+      - name: Get dependencies
+        run: flutter pub get
+
+      - name: Check formatting
+        run: dart format . --set-exit-if-changed
+
+      - name: Run analyzer
+        run: flutter analyze

.github/workflows/flutter_tests_min.yaml

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+# flutter_tests_*.yaml actions are duplicated, because GitHub doesn't support badges for matrix builds.
+name: app_preferences - Tests (3.24.0)
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - master
+  schedule:
+    - cron: "0 0 * * 0"
+
+jobs:
+  build:
+    timeout-minutes: 5
+    name: Flutter tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          cache: true
+          flutter-version: "3.22.0"
+          channel: "stable"
+
+      - name: Print version
+        run: flutter --version
+
+      - name: Get dependencies
+        run: flutter pub get
+
+      - name: Check formatting
+        run: dart format . --set-exit-if-changed
+
+      - name: Run analyzer
+        run: flutter analyze

.github/workflows/flutter_tests_stable.yaml

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+# flutter_tests_*.yaml actions are duplicated, because GitHub doesn't support badges for matrix builds.
+name: app_preferences - Tests (stable)
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - master
+  schedule:
+    - cron: "0 0 * * 0"
+
+jobs:
+  build:
+    timeout-minutes: 5
+    name: Flutter tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          cache: true
+          channel: "stable"
+
+      - name: Print version
+        run: flutter --version
+
+      - name: Get dependencies
+        run: flutter pub get
+
+      - name: Check formatting
+        run: dart format . --set-exit-if-changed
+
+      - name: Run analyzer
+        run: flutter analyze

.github/workflows/publish.yaml

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+name: Publish to pub.dev
+on:
+  push:
+    tags:
+      - "v[0-9]+.[0-9]+.[0-9]+*"
+
+jobs:
+  publish:
+    name: Publish to pub.dev
+    runs-on: ubuntu-latest
+
+    permissions:
+      id-token: write
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v3
+
+      - name: Install Dart
+        uses: dart-lang/setup-dart@v1
+        with:
+          sdk: stable
+
+      - name: Install Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: "stable"
+
+      - name: Publish to pub.dev
+        run: flutter pub publish --force