no; gitea and foregjo both support actions-style CI/CD and both serve mostly GH-compatible APIs and have GH-style apps. it's not 100% compatible (forgejo is a little more compatible than gitea [^1]), but many of your workflows might "just work" without even renaming the .github folder.
^1: in my recent experience, for my particular use cases
^1: in my recent experience, for my particular use cases