Add Deploy workflow

- Extract tests from the CI workflow into a reusable workflow and call
  it from the original
- Add a deploy workflow to automatically deploy to Fly.io
- Call the reusable test workflow from the deploy workflow

.github/workflows/ci.yml

@@ -1,27 +1,5 @@
 name: CI
-on: [push, pull_request]
+on: pull_request
 jobs:
-  test:
-    runs-on: ubuntu-latest
-    services:
-      redis:
-        image: redis
-        ports: ['6379:6379']
-        options: --entrypoint redis-server
-    steps:
-      - uses: actions/checkout@v4
-      - name: Setup Ruby
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: 3.2.2
-      - name: Build and run tests
-        env:
-          REDIS_URL: redis://localhost:6379/0
-          RAILS_ENV: test
-        run: |
-          sudo apt-get -yqq install libpq-dev
-          gem install bundler
-          bundle install --jobs 4 --retry 3
-          bundle exec rails db:prepare
-          bundle exec rails test:all
-          bundle exec rspec
+  call-test:
+    uses: ./.github/workflows/test.yml

.github/workflows/deploy.yml

@@ -0,0 +1,17 @@
+name: Deploy
+on:
+  push:
+    branches:
+      - main
+jobs:
+  call-test:
+    uses: ./.github/workflows/test.yml
+  deploy:
+    name: Deploy app
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: superfly/flyctl-actions/setup-flyctl@master
+      - run: flyctl deploy --remote-only
+        env:
+          FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}

.github/workflows/test.yml

@@ -0,0 +1,26 @@
+on: workflow_call
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    services:
+      redis:
+        image: redis
+        ports: ['6379:6379']
+        options: --entrypoint redis-server
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.2.2
+      - name: Build and run tests
+        env:
+          REDIS_URL: redis://localhost:6379/0
+          RAILS_ENV: test
+        run: |
+          sudo apt-get -yqq install libpq-dev
+          gem install bundler
+          bundle install --jobs 4 --retry 3
+          bundle exec rails db:prepare
+          bundle exec rails test:all
+          bundle exec rspec