Improve self host support (#28)

* Add docker setup for self hosting

* Add ses settings tables

docker-compose.yml

@@ -0,0 +1,56 @@
+name: unsend-prod
+
+services:
+  postgres:
+    image: postgres:16
+    container_name: postgres
+    restart: always
+    environment:
+      - POSTGRES_USER=${POSTGRES_USER:?err}
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD:?err}
+      - POSTGRES_DB=${POSTGRES_DB:?err}
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER}"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    volumes:
+      - database:/var/lib/postgresql/data
+
+    # You don't need to expose this port to the host since, docker compose creates an internal network
+    # through which both of these containers could talk to each other using their container_name as hostname
+    # But if you want to connect this to a querying tool to debug you can definitely uncomment this
+    # ports:
+    #   - "5432:5432"
+
+  unsend:
+    build:
+      dockerfile: Dockerfile
+    image: unsend
+    container_name: unsend
+    restart: always
+    ports:
+      - ${PORT:-3000}:${PORT:-3000}
+    environment:
+      - PORT=${PORT:-3000}
+      - DATABASE_URL=${DATABASE_URL:?err}
+      - NEXTAUTH_URL=${NEXTAUTH_URL:?err}
+      - NEXTAUTH_SECRET=${NEXTAUTH_SECRET:?err}
+      - AWS_ACCESS_KEY=${AWS_ACCESS_KEY:?err}
+      - AWS_SECRET_KEY=${AWS_SECRET_KEY:?err}
+      - AWS_DEFAULT_REGION=${AWS_DEFAULT_REGION:?err}
+      - GITHUB_ID=${GITHUB_ID:?err}
+      - GITHUB_SECRET=${GITHUB_SECRET:?err}
+      - APP_URL=${APP_URL:-${NEXTAUTH_URL}}
+      - SNS_TOPIC=${SNS_TOPIC:?err}
+      - NEXT_PUBLIC_IS_CLOUD=${NEXT_PUBLIC_IS_CLOUD:-false}
+      - GOOGLE_CLIENT_ID=${GOOGLE_CLIENT_ID}
+      - GOOGLE_CLIENT_SECRET=${GOOGLE_CLIENT_SECRET}
+      - SES_QUEUE_LIMIT=${SES_QUEUE_LIMIT:-1}
+      - API_RATE_LIMIT=${API_RATE_LIMIT:-1}
+    depends_on:
+      postgres:
+        condition: service_healthy
+
+volumes:
+  database: