add .github dir to run GitHub Actions CI + dependabot

.github/dependabot.yml

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+version: 2
+updates:
+- package-ecosystem: mix
+  directory: "/"
+  schedule:
+    interval: weekly
+    time: "17:00"
+    timezone: Europe/London
+  ignore:
+      # ignore all patch updates in dev dependencies ref: github.com/dwyl/technology-stack/issues/126 [alphabetical list]
+    - dependency-name: "excoveralls"
+      update-types: ["version-update:semver-patch"]
+    - dependency-name: "ex_doc"
+      update-types: ["version-update:semver-patch"]

.github/workflows/dart.yml

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+name: Dart CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: macos-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      # Installing Flutter because it's easier to generate .lcov files for test coverage
+      - name: Install Flutter
+        uses: subosito/flutter-action@v2
+
+      - name: Install dependencies
+        run: dart pub get
+
+      # Your project will need to have tests in test/ and a dependency on
+      # package:test for this step to succeed. Note that Flutter projects will
+      # want to change this to 'flutter test'.
+      - name: Run tests
+        run: flutter test --coverage
+
+      - uses: codecov/codecov-action@v2
+        with:
+          files: coverage/lcov.info
+          verbose: true # optional (default = false)

.github/workflows/elixir.yml

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+name: Elixir CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    name: Build and test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          elixir-version: "1.14.2" # Define the elixir version [required]
+          otp-version: "25.1.2" # Define the OTP version [required]
+      - name: Restore dependencies cache
+        uses: actions/cache@v2
+        with:
+          path: deps
+          key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
+          restore-keys: ${{ runner.os }}-mix-
+      - name: Install Elixir dependencies
+        run: mix deps.get
+      - name: Run Tests
+        run: mix coveralls.json
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v1