.github: Create codeql.yml

[justaugustus]

We have CodeQL enabled but currently only configured to run post-merge:

allstar/.github/workflows/postmerge.yaml

Lines 10 to 34 in a10a639

	codeql:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
	- uses: github/codeql-action/init@b611370bb5703a7efb587f9d136a52ea24c5c38c # v3.25.11
	with:
	languages: go
	- uses: github/codeql-action/autobuild@b611370bb5703a7efb587f9d136a52ea24c5c38c # v3.25.11
	- uses: github/codeql-action/analyze@b611370bb5703a7efb587f9d136a52ea24c5c38c # v3.25.11
	scorecard:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
	- uses: ossf/scorecard-action@dc50aa9510b46c811795eb24b2f1ba02a914e534 # v2.3.3
	with:
	results_file: results.sarif
	results_format: sarif
	- uses: actions/upload-artifact@65462800fd760344b1a7b4382951275a0abb4808 # v4.3.3
	with:
	name: SARIF file
	path: results.sarif
	retention-days: 5
	- uses: github/codeql-action/upload-sarif@b611370bb5703a7efb587f9d136a52ea24c5c38c # v3.25.11
	with:
	sarif_file: results.sarif

[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.

[justaugustus]

https://github.com/ossf/allstar/pull/533/checks?check_run_id=26964402825 can be ignored, since that config block was removed in this PR.