Set up GitHub Actions for C#3

iand675 wants to merge 1 commit intomasteriand675/fastly:masterfrom

claude/setup-github-actions-ci-011CUbbK494cmMq85sL2n8nEiand675/fastly:claude/setup-github-actions-ci-011CUbbK494cmMq85sL2n8nECopy head branch name to clipboard