Add Gitea Actions workflows, CI config, and docs

CODE_OF_CONDUCT.md

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+# Code of Conduct — ${REPO_NAME}
+
+## Our Pledge
+
+We pledge to make participation in this project a harassment-free experience for
+everyone, regardless of age, body size, disability, ethnicity, gender identity
+and expression, level of experience, nationality, personal appearance, race,
+religion, or sexual identity and orientation.
+
+## Our Standards
+
+**Positive behavior includes:**
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints
+- Gracefully accepting constructive criticism
+- Focusing on what is best for the community
+
+**Unacceptable behavior includes:**
+- Trolling, insulting comments, and personal attacks
+- Public or private harassment
+- Publishing others' private information without permission
+- Other conduct which could reasonably be considered inappropriate
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the project maintainers. All complaints will be reviewed and
+investigated and will result in a response that is deemed necessary and
+appropriate to the circumstances.
+
+## Attribution
+
+This Code of Conduct is adapted from the
+[Contributor Covenant](https://www.contributor-covenant.org/), version 2.1.