Tracking issue: Developer Experience

[austinvazquez]

This is a tracking issue for some simple project improvements.

### GitHub Actions
- [x] Basic CI (run test on PR) - https://github.com/docker/go-events/pull/33
- [ ] Add DCO check
- [ ] Add static analysis - https://github.com/docker/go-events/pull/35
- [ ] Add security analysis workflow - https://github.com/docker/go-events/pull/37

### Local development
- [ ] Add devcontainer configuration