ADD user to docker-compose (#6085)

examples/with-firebase-hosting-and-docker/docker-compose.deploy.yml

 version: '3.5'
 services:
   server:
+    user: 1000:1000
     volumes:
       - .:/app
     command: sh -c "yarn --production=false && yarn clean && yarn deploy --project "$FB_PROJECTID""

examples/with-firebase-hosting-and-docker/docker-compose.dev.yml

 version: '3.5'
 services:
   server:
+    user: 1000:1000
     volumes:
       - .:/app
     command: sh -c "yarn --production=false && yarn dev"

examples/with-firebase-hosting-and-docker/docker-compose.serve.yml

 version: '3.5'
 services:
   server:
+    user: 1000:1000
     volumes:
       - .:/app
     command: sh -c 'yarn --production=false && yarn clean && yarn build-app && yarn serve --project "$FB_PROJECTID"'