Add Algol68 tests

[rzuckerm]

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I Am Adding New Tests for a Language

• I fixed Add Algol68 Testing #2694
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Other Notes

I couldn't get the tests to work locally, but I was able to run hello-world locally with this:

$ (venv) ./samplerunner.sh run -l algol68

Running "hello-world.alg"...
Hello, World!

[github-actions]

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[jrg94]

Nice work! Looks like it ran.