fix: use git push instead of GitHub API for tag creation

GIT_API_TAGGING defaults to true, which tries to create tags via the
GitHub REST API (api.github.com). On self-hosted Gitea, this fails.
Setting it to false uses git push origin <tag> instead, which works
with the credentials configured by actions/checkout.

.gitea/workflows/docker-build.yaml

@@ -55,3 +55,4 @@ jobs:
           DEFAULT_BUMP: patch
           RELEASE_BRANCHES: main
           WITH_V: true
+          GIT_API_TAGGING: false