demonstrate docker port change works successfully

docker-compose.yml

@@ -7,8 +7,8 @@ services:
     tty: true
     working_dir: /mermaid
     mem_limit: '8G'
-    environment:
-      - MERMAID_PORT
+    env_file:
+      - .env
     volumes:
       - ./:/mermaid
       - root_cache:/root/.cache
@@ -16,7 +16,7 @@ services:
       - root_npm:/root/.npm
       - /tmp:/tmp
     ports:
-      - '${MERMAID_PORT}:9000'
+      - ${MERMAID_PORT}:${MERMAID_PORT}
       - 3333:3333
   cypress:
     image: cypress/included:14.0.3

package.json

@@ -41,7 +41,7 @@
     "e2e:coverage": "pnpm run load:env -- pnpm run e2e:harness:coverage",
     "e2e:harness": "start-server-and-test dev http://localhost:${MERMAID_PORT}/ cypress",
     "e2e:harness:coverage": "start-server-and-test dev:coverage http://localhost:${MERMAID_PORT}/ cypress",
-    "load:env": "dotenv -e .env.development -e .env",
+    "load:env": "dotenv -e .env",
     "test": "pnpm lint && vitest run",
     "test:watch": "vitest --watch",
     "test:coverage": "vitest --coverage",