Add GitHub Actions (#211)

* Add 'run-tests' action to run specs
* Add 'push-to-registry' action to push image to Docker Hub

.github/workflows/push-to-registry.yml

@@ -0,0 +1,38 @@
+# Build production image and push to Docker Hub
+
+name: Push to registry
+
+on:
+  push:
+    branches:
+      - 'main'
+    tags:
+      - '**'
+
+jobs:
+  push-to-registry:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: ./Dockerfile
+          target: prod
+          build-args: |
+            ENVIRONMENT=production
+          push: true
+          tags: |
+            riggraz/astuto:latest
+            riggraz/astuto:${{ github.sha }}
+            riggraz/astuto:${{ github.ref_type == 'tag' && github.ref_name || 'latest'}}

.github/workflows/run-tests.yml

@@ -0,0 +1,48 @@
+# Build production image and run tests on it
+
+name: Run tests
+
+on:
+  workflow_dispatch:
+
+  pull_request:
+    paths:
+      - '**'
+
+jobs:
+  test:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Build Docker production image
+        run: docker compose -f docker-compose.yml -f docker-compose-prod.yml build --build-arg ENVIRONMENT=production
+
+      - name: Run Docker containers
+        run: docker compose -f docker-compose.yml -f docker-compose-prod.yml up --detach
+
+      - name: Install required packages
+        run: |
+          docker compose exec web apt-get update
+          docker compose exec web apt-get install -y --no-install-recommends apt-utils
+          docker compose exec web apt-get install -y build-essential wget libpq-dev
+
+      - name: Install RSpec and required gems
+        run: |
+          docker compose exec web bundle config set --local without development
+          docker compose exec web bundle config set deployment false --local
+          docker compose exec web bundle install
+
+      - name: Install Google Chrome
+        run: |
+          docker compose exec web wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
+          docker compose exec web dpkg -i google-chrome-stable_current_amd64.deb || true
+          docker compose exec web apt-get -fy install
+
+      - name: Prepare assets for test environment
+        run: docker compose exec web cp -r public/packs/ public/packs-test/
+        
+      - name: Run tests
+        run: docker compose exec web bundle exec rspec