Add GitHub CI workflows

.github/workflows/lint.yml

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+name: Lint
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+env:
+  RUBY_VERSION: 3.1.1
+  NODE_VERSION: 18.17.1
+
+jobs:
+  lint:
+    name: Lint code
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/[email protected]
+        with:
+          fetch-depth: 1
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ env.RUBY_VERSION }}
+          bundler-cache: true
+
+      - uses: actions/setup-node@master
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+
+      - run: bundle exec rubocop -P
+        name: Lint Ruby files
+
+      - run: bundle exec mdl *.md
+        name: Lint Markdown files
+
+      - run: bundle exec erblint app/views/**/*.erb
+        name: Lint ERB files
+
+      - run: npm run stylelint
+        name: Lint SCSS files
+
+      - run: npm run lint
+        name: Lint JS files

.github/workflows/test.yml

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+name: Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+env:
+  RUBY_VERSION: 3.1.1
+  NODE_VERSION: 18.17.1
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres:11
+        ports:
+          - 5432:5432
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_HOST_AUTH_METHOD: trust
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ env.RUBY_VERSION }}
+          bundler-cache: true
+
+      - uses: actions/setup-node@master
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+
+      - name: Bundle Install
+        run: bundle install
+
+      - name: Setup & create Database
+        run: bundle exec rake db:test:prepare
+        env:
+          RAILS_ENV: test
+          DATABASE_USERNAME: postgres
+          DATABASE_PASSWORD: postgres
+
+      - name: Precompile assets
+        run: |
+          npm install
+          bundle exec rake assets:precompile
+        env:
+          RAILS_ENV: test
+          DATABASE_USERNAME: postgres
+          DATABASE_PASSWORD: postgres
+
+      - name: Run RSpec
+        run: SIMPLECOV=1 bundle exec rspec
+        env:
+          RAILS_ENV: test
+          DATABASE_USERNAME: postgres
+          DATABASE_PASSWORD: postgres