Update GitHub Actions

[mattldawson]

Updates the GitHub actions to include the proper dependencies.

The tests still fail, but because of existing memory issues in the tests:

2025-09-02T23:47:11.9147772Z 86% tests passed, 8 tests failed out of 58
2025-09-02T23:47:11.9148313Z 
2025-09-02T23:47:11.9148478Z Total Test time (real) = 656.46 sec
2025-09-02T23:47:11.9148816Z 
2025-09-02T23:47:11.9148962Z The following tests FAILED:
2025-09-02T23:47:11.9149359Z 	 20 - memcheck_growclr (Failed)
2025-09-02T23:47:11.9149779Z 	 22 - memcheck_growin (Failed)
2025-09-02T23:47:11.9150483Z 	 24 - memcheck_growsub (Failed)
2025-09-02T23:47:11.9150925Z 	 26 - memcheck_grow (Failed)
2025-09-02T23:47:11.9151398Z 	 30 - memcheck_kappawetr (Failed)
2025-09-02T23:47:11.9151714Z 	 34 - memcheck_nuc2 (Failed)
2025-09-02T23:47:11.9151993Z 	 36 - memcheck_nuc (Failed)
2025-09-02T23:47:11.9152453Z 	 38 - memcheck_pheat (Failed)
2025-09-02T23:47:11.9152858Z Errors while running CTest
2025-09-02T23:47:11.9181975Z ##[error]Process completed with exit code 8.

A separate issue will be created to look into these.

[Copilot]

Pull Request Overview

This PR updates the GitHub Actions Ubuntu workflow to install necessary system dependencies before building the project. The change adds a new step to install cmake, gfortran, and various NetCDF and LAPACK libraries that are required for the build process.

• Adds dependency installation step with apt-get commands
• Installs build tools (cmake, gfortran) and scientific computing libraries (NetCDF, LAPACK, BLAS)

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