Added devcontainer support

.devcontainer/Dockerfile

@@ -0,0 +1,3 @@
+# Make sure RUBY_VERSION matches the Ruby version in .ruby-version
+ARG RUBY_VERSION=3.1.0
+FROM ghcr.io/rails/devcontainer/images/ruby:$RUBY_VERSION

.devcontainer/compose.yaml

@@ -0,0 +1,68 @@
+services:
+  rails-app:
+    build:
+      context: ..
+      dockerfile: .devcontainer/Dockerfile
+
+    volumes:
+    - ../..:/workspaces:cached
+
+    # Overrides default command so things don't shut down after the process ends.
+    command: sleep infinity
+
+    networks:
+    - default
+
+    # Uncomment the next line to use a non-root user for all processes.
+    # user: vscode
+
+    # Use "forwardPorts" in **devcontainer.json** to forward an app port locally.
+    # (Adding the "ports" property to this file will not forward from a Codespace.)
+    ports:
+    - 45678:45678
+    depends_on:
+    - selenium
+    - redis
+    - mysql
+    - postgres
+
+  selenium:
+    image: seleniarm/standalone-chromium
+    restart: unless-stopped
+    networks:
+    - default
+
+  redis:
+    image: redis:7.2
+    restart: unless-stopped
+    networks:
+    - default
+    volumes:
+    - redis-data:/data
+
+  mysql:
+    image: mysql/mysql-server:8.0
+    restart: unless-stopped
+    environment:
+        MYSQL_ALLOW_EMPTY_PASSWORD: 'true'
+        MYSQL_ROOT_HOST: "%"
+    volumes:
+    - mysql-data:/var/lib/mysql
+    networks:
+    - default
+
+  postgres:
+    image: postgres:16.1
+    restart: unless-stopped
+    networks:
+    - default
+    volumes:
+    - postgres-data:/var/lib/postgresql/data
+    environment:
+        POSTGRES_USER: postgres
+        POSTGRES_PASSWORD: postgres
+
+volumes:
+  redis-data:
+  mysql-data:
+  postgres-data:

.devcontainer/devcontainer.json

@@ -0,0 +1,38 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/ruby
+{
+  "name": "pay_gem",
+  "dockerComposeFile": "compose.yaml",
+  "service": "rails-app",
+  "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+
+  // Features to add to the dev container. More info: https://containers.dev/features.
+  "features": {
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    "ghcr.io/rails/devcontainer/features/activestorage": {},
+    "ghcr.io/rails/devcontainer/features/mysql-client": {},
+    "ghcr.io/rails/devcontainer/features/postgres-client": {}
+  },
+
+  "containerEnv": {
+    "CAPYBARA_SERVER_PORT": "45678",
+    "SELENIUM_HOST": "selenium",
+    "REDIS_URL": "redis://redis:6379/1",
+    "DATABASE_URL": "sqlite3:test.sqlite3"
+    // "DATABASE_URL": "postgresql://postgres:postgres@postgres:5432/test"
+    // "DATABASE_URL": "mysql2://root@mysql:3306/test"
+  },
+
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  "forwardPorts": [3000, 3306, 5432, 6379],
+
+  // Configure tool-specific properties.
+  // "customizations": {},
+
+  // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+  // "remoteUser": "root",
+
+
+  // Use 'postCreateCommand' to run commands after the container is created.
+  "postCreateCommand": "bin/setup"
+}

README.md

@@ -55,6 +55,10 @@ Want to add a new payment provider? Contributions are welcome.
 
 If you have an issue you'd like to submit, please do so using the issue tracker in GitHub. In order for us to help you in the best way possible, please be as detailed as you can.
 
+For those using devcontainers, if you want to test the application with different databases:
+1. Uncomment the `DATABASE_URL` corresponding to the database type you wish to use in the `.devcontainer/devcontainer.json` file.
+2. Rebuild the devcontainer, which will configure the application to use the selected database for your development environment.
+
 If you'd like to open a PR please make sure the following things pass:
 
 ```ruby