Add Issue Triage automation to project for usnistgov/OSCAL#1209.

[aj-stein-nist]

Committer Notes

This pull requests adds automation so that any new issue (and only new issues) will be added to this repository's Issue Triage board and its Needs Triage to initiate the triage process. This PR is part of a tracker issue for relevant repos in usnistgov/OSCAL#1209.

This has been tested in a dummy organization with example issues (one with no project board configured on creation, the other intentionally with the project assigned. If other test cases are needed, please advise. (Re the issue acceptance criteria, the on: [opened] filter for issues will most assuredly prevent this from being applied to existing issues.

Project board: https://github.com/ImportantFederalAgencyTest/create-project-card-test/projects/1

Example Issue 1: ImportantFederalAgencyTest/create-project-card-test#1
Example Issue 1's GitHub Action run: https://github.com/ImportantFederalAgencyTest/create-project-card-test/actions/runs/2185526148

Example Issue 2: ImportantFederalAgencyTest/create-project-card-test#2
Example Issue 2's GitHUb Action run: https://github.com/ImportantFederalAgencyTest/create-project-card-test/actions/runs/2185661979

All Submissions:

• Have you selected the correct base branch per Contributing guidance?
• Have you set "Allow edits and access to secrets by maintainers
  "?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you squashed any non-relevant commits and commit messages? [instructions]
• Do all automated CI/CD checks pass?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you included examples of how to use your new feature(s)?
• Have you updated all OSCAL website and readme documentation affected by the changes you made? Changes to the OSCAL website can be made in the docs/content directory of your branch.

[aj-stein-nist]

NOTE: Recommended to merge this after #204, or rebase and cleanup will be required.

[david-waltermire]

LGTM. Thanks!