Add prod compose config

Caddyfile

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+racingla.ewi.tudelft.nl {
+	header X-Clacks-Overhead "GNU Terry Pratchett"
+	reverse_proxy web:3000
+}

compose.yaml

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+name: graph
+
+
+services:
+  caddy:
+    image: docker.io/caddy:2.8-alpine
+    ports:
+      - 80:80
+      - 443:443
+    volumes:
+      - ./Caddyfile:/etc/caddy/Caddyfile
+      - caddy_data:/data
+      - caddy_config:/config
+
+  web:
+    image: ghcr.io/prime-tu-delft/graph
+    environment:
+      DATABASE_URL: ${DATABASE_URL}
+
+  db:
+    image: postgres:16
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+      POSTGRES_DB: ${POSTGRES_DB}
+
+
+volumes:
+  postgres_data:
+  caddy_data:
+  caddy_config: