Update GH actions to update packages for ubuntu debug regression test

[bjonkman]

For the past week, the OpenFAST GH actions for the ubuntu debug regression tests were failing with this error:

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/l/lxml/python3-lxml_4.5.0-1ubuntu0.3_amd64.deb 404 Not Found [IP: 52.250.76.244 80]

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?


Error: Process completed with exit code 100.

The requested package version wasn't available, but a newer one was. This PR adds the apt-get update command to the workflow to fix the problem.

[rafmudaf]

Was it always failing for you @bjonkman or just intermittently? Those two cases passed here but I'm wondering if this really fixed it.

[andrew-platt]

Failing here this morning with same error: https://github.com/OpenFAST/openfast/runs/4871964256?check_suite_focus=true

[bjonkman]

It always failed with exit code 100. It was looking for version 0.3 of that file (python3-lxml_4.5.0-1ubuntu0.3_amd64.deb), which no longer exists in the two places it was looking (If I'm reading the messages correctly, it checked both http://azure.archive.ubuntu.com/ubuntu and http://security.ubuntu.com/ubuntu previously). It is now looking for version 0.5 of that file (python3-lxml_4.5.0-1ubuntu0.5_amd64.deb) and finding it.

[rafmudaf]

Ok great, then it looks like this is a fix. Thanks @bjonkman!