Docker部署Mattermost时环境变量未识别报错求助

我按照官方指南在Docker上部署Mattermost，计划用Traefik做反向代理，因此采用docker-compose.without-nginx.yml配置。复制并调整.env文件后，执行命令：

sudo docker-compose -f docker-compose.yml -f docker-compose.without-nginx.yml up -d

返回以下错误：

WARN[0000] The "POSTGRES_IMAGE_TAG" variable is not set. Defaulting to a blank string.
WARN[0000] The "RESTART_POLICY" variable is not set. Defaulting to a blank string.
WARN[0000] The "POSTGRES_DATA_PATH" variable is not set. Defaulting to a blank string.
WARN[0000] The "RESTART_POLICY" variable is not set. Defaulting to a blank string.
WARN[0000] The "MATTERMOST_CONFIG_PATH" variable is not set. Defaulting to a blank string.
WARN[0000] The "MATTERMOST_DATA_PATH" variable is not set. Defaulting to a blank string.
WARN[0000] The "MATTERMOST_LOGS_PATH" variable is not set. Defaulting to a blank string.
WARN[0000] The "MATTERMOST_PLUGINS_PATH" variable is not set. Defaulting to a blank string.
WARN[0000] The "MATTERMOST_CLIENT_PLUGINS_PATH" variable is not set. Defaulting to a blank string.
WARN[0000] The "MATTERMOST_BLEVE_INDEXES_PATH" variable is not set. Defaulting to a blank string.
WARN[0000] The "MATTERMOST_CONTAINER_READONLY" variable is not set. Defaulting to a blank string.
error while interpolating services.mattermost.read_only: failed to cast to expected type: invalid boolean:

我的.env文件配置如下：

# Domain of service
DOMAIN=my-sub.domain.com

# Container settings
## Timezone inside the containers. The value needs to be in the form 'Europe/Berlin'.
## A list of these tz database names can be looked up at Wikipedia
## https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
TZ=Europe/Berlin
RESTART_POLICY=unless-stopped

# Postgres settings
## Documentation for this image and available settings can be found on hub.docker.com
## https://hub.docker.com/_/postgres
## Please keep in mind this will create a superuser and it's recommended to use a less privileged
## user to connect to the database.
## A guide on how to change the database user to a nonsuperuser can be found in docs/creation-of-nonsuperuser.md
POSTGRES_IMAGE_TAG=13-alpine
POSTGRES_DATA_PATH=./volumes/db/var/lib/postgresql/data

POSTGRES_USER=adjustedusername
POSTGRES_PASSWORD=adjustedpassword
POSTGRES_DB=mattermost

# Nginx
## The nginx container will use a configuration found at the NGINX_MATTERMOST_CONFIG. The config aims
## to be secure and uses a catch-all server vhost which will work out-of-the-box. For additional settings
## or changes ones can edit it or provide another config. Important note: inside the container, nginx sources
## every config file inside */etc/nginx/conf.d* ending with a *.conf* file extension.

## Inside the container the uid and gid is 101. The folder owner can be set with
## `sudo chown -R 101:101 ./nginx` if needed.
NGINX_IMAGE_TAG=alpine

## The folder containing server blocks and any additional config to nginx.conf
NGINX_CONFIG_PATH=./nginx/conf.d
NGINX_DHPARAMS_FILE=./nginx/dhparams4096.pem

CERT_PATH=./volumes/web/cert/cert.pem
KEY_PATH=./volumes/web/cert/key-no-password.pem
#GITLAB_PKI_CHAIN_PATH=<path_to_your_gitlab_pki>/pki_chain.pem
#CERT_PATH=./certs/etc/letsencrypt/live/${DOMAIN}/fullchain.pem
#KEY_PATH=./certs/etc/letsencrypt/live/${DOMAIN}/privkey.pem

## Exposed ports to the host. Inside the container 80 and 443 will be used
HTTPS_PORT=443
HTTP_PORT=80

# Mattermost settings
## Inside the container the uid and gid is 2000. The folder owner can be set with
## `sudo chown -R 2000:2000 ./volumes/app/mattermost`.
MATTERMOST_CONFIG_PATH=./volumes/app/mattermost/config
MATTERMOST_DATA_PATH=./volumes/app/mattermost/data
MATTERMOST_LOGS_PATH=./volumes/app/mattermost/logs
MATTERMOST_PLUGINS_PATH=./volumes/app/mattermost/plugins
MATTERMOST_CLIENT_PLUGINS_PATH=./volumes/app/mattermost/client/plugins
MATTERMOST_BLEVE_INDEXES_PATH=./volumes/app/mattermost/bleve-indexes

## Bleve index (inside the container)
MM_BLEVESETTINGS_INDEXDIR=/mattermost/bleve-indexes

## This will be 'mattermost-enterprise-edition' or 'mattermost-team-edition' based on the version of Mattermost you're installing.
MATTERMOST_IMAGE=mattermost-team-edition
MATTERMOST_IMAGE_TAG=7.1

## Make Mattermost container readonly. This interferes with the regeneration of root.html inside the container. Only use
## it if you know what you're doing.
## See https://github.com/mattermost/docker/issues/18
MATTERMOST_CONTAINER_READONLY=false

## The app port is only relevant for using Mattermost without the nginx container as reverse proxy. This is not meant
## to be used with the internal HTTP server exposed but rather in case one wants to host several services on one host
## or for using it behind another existing reverse proxy.
APP_PORT=8065

## Configuration settings for Mattermost. Documentation on the variables and the settings itself can be found at
## https://docs.mattermost.com/administration/config-settings.html
## Keep in mind that variables set here will take precedence over the same setting in config.json. This includes
## the system console as well and settings set with env variables will be greyed out.

## Below one can find necessary settings to spin up the Mattermost container
MM_SQLSETTINGS_DRIVERNAME=postgres
MM_SQLSETTINGS_DATASOURCE=postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@postgres:5432/${POSTGRES_DB}?sslmode=disable&connect_timeout=10

## Example settings (any additional setting added here also needs to be introduced in the docker-compose.yml)
MM_SERVICESETTINGS_SITEURL=https://${DOMAIN}

• 确保.env文件与命令执行目录一致
  执行docker-compose命令时，必须在存放.env文件的目录下操作，否则工具无法读取环境变量。如果不在同一目录，可通过--env-file参数指定文件绝对路径：

  sudo docker-compose --env-file /绝对路径/你的.env文件 -f docker-compose.yml -f docker-compose.without-nginx.yml up -d
  

• 检查.env文件格式

  • 变量赋值不能有多余空格，比如MATTERMOST_CONTAINER_READONLY=false前后不能留空格
  • 确认变量名拼写完全匹配docker-compose文件中的引用，比如POSTGRES_IMAGE_TAG不能写错
  • 布尔值必须用小写（true/false），docker-compose对布尔值大小写敏感

• 验证docker-compose文件的变量引用
  检查docker-compose.without-nginx.yml中services.mattermost.read_only是否正确指向${MATTERMOST_CONTAINER_READONLY}，引用错误会导致布尔值解析失败。

• 清理缓存后重试
  旧环境变量缓存可能导致问题，执行以下命令清理后重新启动：

  sudo docker-compose -f docker-compose.yml -f docker-compose.without-nginx.yml down
  sudo docker-compose -f docker-compose.yml -f docker-compose.without-nginx.yml up -d --force-recreate
  

内容的提问来源于stack exchange，提问作者Harald Töpfer