Concisely describe what has been changed/addressed in the pull request.
Adding a github action that that is only triggered manually to build admb and ss3 from source for windows, mac, and linux. This action is a backup for if/when the admb docker images don't work. Building both admb and ss3 from source gives us more control over the g++ libraries too. Successful GitHub actions run of this workflow.
For windows, admb is specifically built using the compilers in Rtools 42.
Also updated the actions/checkout to version 4 for all workflows
What tests have been done?
Where are the relevant files?
[x] No test files are required for this pull request. -->
What tests/review still need to be done?
None.
Is there an input change for users to Stock Synthesis?
Concisely describe what has been changed/addressed in the pull request.
What tests have been done?
Where are the relevant files?
What tests/review still need to be done?
None.
Is there an input change for users to Stock Synthesis?
Additional information (optional).