Fixup iceberg GitHub Action workflow

[kennknowles]

There was an interpolation variable incidentally left in it when I forked from another file.

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[Abacn]

Let's also add this workflow to https://github.com/apache/beam/blob/master/.github/workflows/README.md so there is an eye on the status of it

I would suggest keep the naming convention (beam_PreCommit_Java_Iceberg_IO_Direct.yml). The naming was inherited from Jenkins job names. I understand it may be verbose and not ideal, but until we get it all clean up let's keep this convention

[Abacn]

We can keep this. The phrase trigger for PreCommit is currently working

[kennknowles]

Done

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[kennknowles]

https://github.com/apache/beam/actions/runs/8650999727/job/23720718775 shows that it works and finds a problem in the module (so this PR should be merged)