moorefu opened a new issue #1922:
URL: https://github.com/apache/incubator-apisix/issues/1922
i think we can support defined environment variable in config.yaml like this
```
nginx_config:
...
environment:
TNS_ADMIN:
DATACENTER_ID: 1
```
and render the template to genarate nginx.conf like this
```
...
env APISIX_PROFILE;
env TNS_ADMIN;
env DATACENTER_ID=1;
...
```
it is a useful feature.
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