Trigger GitHub workflows instead of Azure Pipelines#4

dscho merged 9 commits intomaingitgitgadget/gitgitgadget-github-app:mainfrom

migrate-gitgitgadget-to-github-actionsgitgitgadget/gitgitgadget-github-app:migrate-gitgitgadget-to-github-actionsCopy head branch name to clipboard