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Include a "new in" tag to templates section 

The templates script that uses `envsubst` is not available in the current stable version (1.18).

Hope this information saves others some debugging time.
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Cláudio 2020-06-23 11:49:29 +01:00 committed by GitHub
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nginx/content.md
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@ -66,7 +66,7 @@ Then build the image with `docker build -t custom-nginx .` and run it as follows
$ docker run --name my-custom-nginx-container -d custom-nginx
```
### Using environment variables in %%IMAGE%% configuration
### Using environment variables in %%IMAGE%% configuration (new in 1.19)
Out-of-the-box, %%IMAGE%% doesn't support environment variables inside most configuration blocks. But this image has a function, which will extract environment variables before %%IMAGE%% starts.