👩‍🌾 Set LD_LIBRARY_PATH on Actions CI (fix user_commands test)

[chapulina]

🦟 Bug fix

Fixes #634 on GitHub actions (possibly on Homebrew too?)

Summary

The test failures on GitHub actions print:

Error while loading the library [/usr/local/lib/ign-gazebo-5/plugins/libignition-gazebo-sensors-system.so]: libignition-gazebo5-rendering.so.5: cannot open shared object file: No such file or directory
  [Err] [SystemLoader.cc:75] Failed to load system plugin [ignition-gazebo-sensors-system] : couldn't load library on path [/usr/local/lib/ign-gazebo-5/plugins/libignition-gazebo-sensors-system.so].

So it looks like all it needs is the path to where that is installed. I'm not sure why that hasn't come up before with other tests.

I also took the opportunity to increase the required SDF 10 version, which is needed since #636

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge

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https://github.com/osrf/buildfarmer/issues/161

[codecov]

Codecov Report

Merging #650 (6fc7ad5) into ign-gazebo4 (302f5ed) will decrease coverage by 12.60%.
The diff coverage is 56.79%.

@@               Coverage Diff                @@
##           ign-gazebo4     #650       +/-   ##
================================================
- Coverage        77.37%   64.77%   -12.61%     
================================================
  Files              217      232       +15     
  Lines            12217    16562     +4345     
================================================
+ Hits              9453    10728     +1275     
- Misses            2764     5834     +3070     

Impacted Files	Coverage Δ
include/ignition/gazebo/EntityComponentManager.hh	100.00% <ø> (ø)
include/ignition/gazebo/rendering/SceneManager.hh	100.00% <ø> (ø)
.../plugins/component_inspector/ComponentInspector.cc	6.11% <0.00%> (-2.50%)	⬇️
.../plugins/component_inspector/ComponentInspector.hh	28.57% <ø> (ø)
src/gui/plugins/scene3d/Scene3D.cc	8.72% <0.00%> (ø)
src/systems/sensors/Sensors.cc	74.75% <0.00%> (ø)
src/rendering/SceneManager.cc	22.92% <8.79%> (ø)
src/systems/joint_controller/JointController.cc	77.17% <12.50%> (-6.16%)	⬇️
...int_position_controller/JointPositionController.cc	71.29% <12.50%> (-4.71%)	⬇️
src/systems/user_commands/UserCommands.cc	68.57% <35.64%> (-11.09%)	⬇️
... and 34 more

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[ahcorde]

The test is still failing on MacOS https://build.osrfoundation.org/job/ignition_gazebo-ci-pr_any-homebrew-amd64/5088/