Run update.sh

Author: docker-library-bot

composer/README.md

@@ -24,7 +24,7 @@ WARNING:
 
 # Supported tags and respective `Dockerfile` links
 
--	[`2.8.11`, `2.8`, `2`, `latest`](https://github.com/composer/docker/blob/f6200de569370dd62b4b142b74fd6473e9d7e1f6/latest/Dockerfile)
+-	[`2.8.12`, `2.8`, `2`, `latest`](https://github.com/composer/docker/blob/517441df1032e9914b7b7ab43e8ad0ce0d05a14e/latest/Dockerfile)
 
 -	[`2.2.25`, `2.2`](https://github.com/composer/docker/blob/a037fe423a4fef8030b2a8c3131da0934a6295dd/2.2/Dockerfile)
 

varnish/README.md

@@ -147,6 +147,10 @@ Varnish will listen to HTTP traffic on port `80`, and this can be overridden by
 $ docker run --tmpfs /var/lib/varnish/varnishd:exec -p 8080:7777 -e VARNISH_HTTP_PORT=7777 varnish
 ```
 
+### VCL file path
+
+The default Varnish configuration file is `/etc/varnish/default.vcl`, but this can be overridden with the `VARNISH_VCL_FILE` environment variable. This is useful if you want a single image that can be deployed with different configurations baked in it.
+
 ### Extra arguments
 
 Additionally, you can add arguments to `docker run` after `varnish`, if the first argument starts with a `-`, the whole list will be appendend to the [default command](https://github.com/varnish/docker-varnish/blob/master/fresh/debian/scripts/docker-varnish-entrypoint):