Expose headless_rendering sdf tag

[adityapande-1995]

Signed-off-by: Aditya [email protected]
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🎉 New feature

Closes #147

Summary

Exposes the --headless-rendering tag as a sdf tag : <headless_rendering>

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• 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 and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

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[codecov]

Codecov Report

Merging #148 (1fba16a) into ign-launch5 (26ef785) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           ign-launch5     #148   +/-   ##
============================================
  Coverage        32.92%   32.92%           
============================================
  Files                4        4           
  Lines              817      817           
============================================
  Hits               269      269           
  Misses             548      548           

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[azeey]

I'm good with merging without a test since I don't know of a good/easy way to test this

[osrf-triage]

This pull request has been mentioned on Gazebo Community. There might be relevant details there:

https://community.gazebosim.org/t/new-ignition-releases-2022-03-25-fortress-edifice-citadel/1343/1