feat(ci): add workflows for nightly builds and releases

- Introduce separate workflows for nightly and release builds
- Add scripts for version management, asset uploads, and cleanup
- Improve Python environment setup and dependency caching

.gitea/default_merge_message/MERGE_TEMPLATE.md

@@ -0,0 +1,5 @@
+chore(pr): ${PullRequestTitle} ${PullRequestReference}
+
+${PullRequestDescription}
+
+Merged from ${HeadBranch} into ${BaseBranch}