CI: install BLAS / LAPACK / gfortran runtime on Linux#45
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The OMRuntimeExternalC.jl libs-v0.1.0 Linux zip ships the OMC libraries but not their system dependencies. libSimulationRuntimeC.so has DT_NEEDED entries for liblapack.so.3, libblas.so.3 and libgfortran.so.5, which ubuntu-24.04 runners do not provide out of the box. The Julia __init__ pre-load (OpenModelica/OMRuntimeExternalC.jl#15) loads every shipped OMC library correctly, then fails on libSimulationRuntimeC with "liblapack.so.3: cannot open shared object file", taking down every MSL, Spice3 and external-builtin test that goes through structural_simplify or the OMC nonlinear solver. Install liblapack3, libblas3 and libgfortran5 before julia-actions/ setup-julia runs. The Windows x86_64-mingw32 zip is self-contained (libgfortran-5.dll, libgcc_s_seh-1.dll, libopenblas.dll, libstdc++-6.dll and friends are all bundled), so no install step is needed there. Refs JKRT#44, OpenModelica/OMRuntimeExternalC.jl#15 Co-Authored-By: JKRT_CLAUDE <247156613+SVAGEN26@users.noreply.github.com>
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Carries one commit (1679830) onto `ci-revival` so PR #44 picks up the system-library install step.
Why
PR #44's Ubuntu job currently fails with:
```
OMRuntimeExternalC: failed to preload libSimulationRuntimeC
could not load library ".../libSimulationRuntimeC.so"
liblapack.so.3: cannot open shared object file: No such file or directory
```
`libSimulationRuntimeC.so` in the `OMRuntimeExternalC.jl libs-v0.1.0` Linux zip has DT_NEEDED entries for `liblapack.so.3`, `libblas.so.3` and `libgfortran.so.5`. `ubuntu-24.04` runners do not ship those by default. The Julia `init` pre-load fix (OpenModelica/OMRuntimeExternalC.jl#15, merged as v0.3.2) loads every shipped OMC library correctly, then fails on `libSimulationRuntimeC` because BLAS/LAPACK/gfortran are missing from the runner.
The downstream chain is large: every MSL, Spice3 and external-builtin test that goes through `structural_simplify` or the OMC nonlinear solver ends up depending on `libSimulationRuntimeC`. The `UndefVarError: in_c` failures in Spice3 examples and the MSL `Test Failed` clusters in the PR #44 run are all symptoms of this single root cause.
Fix
One step before `julia-actions/setup-julia`:
```yaml
if: runner.os == 'Linux'
run: sudo apt-get update && sudo apt-get install -y --no-install-recommends liblapack3 libblas3 libgfortran5
```
Linux-only. The Windows `x86_64-mingw32` zip in the same release is self-contained (ships its own `libgfortran-5.dll`, `libopenblas.dll`, `libstdc++-6.dll`, etc.), so no install step is needed there. macOS is not in this PR's matrix.
Test plan
Refs #44, OpenModelica/OMRuntimeExternalC.jl#15