Add first-class support for configuring tmpfs

[vpavic]

Since docker-java added support for tmpfs in 3.1.0-rc-3 (see docker-java/docker-java#1022), it is now possible to configure TestContainers to use tmpfs using something like:

withCreateContainerCmdModifier(cmd -> cmd.getHostConfig().withTmpFs(
		Collections.singletonMap(System.getProperty("java.io.tmpdir"), "rw")));

It would be nice if TestContainers could enhance it's API to provide a way to configure this a bit simpler.

[bsideup]

Hi @vpavic,

That's indeed something we could add 👍

FYI @rnorth was experimenting with TmpFS but the results were not that impressive back then if I remember correctly.

[mbaechler]

We use TmpFs for some time now on Apache James project and the gain is huge.

[rnorth]

Let's give it a go again! It's not hard to do, so fair to add it for teams that will benefit.

[malltshik]

How about this solution? Is it okay?
new GenericContainer().withTmpFs(singletonMap("/path", "rw")

[rnorth]

Released in 1.10.4!

Thanks for the contribution!