Fix Phoenix template for real

[wilfonba]

Description

Updates Phoenix template to use srun rather than mpirun. Minor source code change to trigger full CI as well.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 43.63%. Comparing base (068da2c) to head (2207581).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/simulation/m_time_steppers.fpp	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #824   +/-   ##
=======================================
  Coverage   43.63%   43.63%           
=======================================
  Files          66       66           
  Lines       19835    19835           
  Branches     2433     2433           
=======================================
  Hits         8655     8655           
  Misses       9688     9688           
  Partials     1492     1492           

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