chore: remove references to ubuntu 18.04 ahead of EOL
While we will still build for 18.04, we will now stop testing against it. Instead, we will test against 20.04, the next EOL release after 18.04. Once Ubuntu 18.04 is EOL, any references to it will also be removed. Note that 18.04 support was already deprecated in Dokku 0.28.0, so this change is just acknowledging that deprecation.
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@@ -147,7 +147,7 @@ Dokku will extract all tcp ports exposed using the `EXPOSE` directive (one port
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For example, if the Dokku installation is configured with the domain `dokku.me` and an application named `node-js-app` is deployed with following Dockerfile:
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```
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FROM ubuntu:18.04
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FROM ubuntu:20.04
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EXPOSE 1234
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RUN python -m SimpleHTTPServer 1234
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```
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