Add reference CI workflow template with hardened GitHub Actions defaults#60

Copilot wants to merge 9 commits into

copilot/12223-update-transaction-validationTuneMe81/projects-info:copilot/12223-update-transaction-validationfrom

copilot/fix-commit-issue-againTuneMe81/projects-info:copilot/fix-commit-issue-againCopy head branch name to clipboard