* Add mergify.yml.
* Abstract out CI jobs to a "success" job so that a change in the CI jobs don't require modification to mergify configuration on stable branch.
* Add new jobs to the `needs` list of `test-suite-success`.
* Set `batch_max_wait_time` to 60 s.
## Issue Addressed
N/A
## Proposed Changes
We set a `$TAG` env variable in the github actions workflow, and then re-use this name in the `publish.sh` script. It makes this check `if [[ -z "$TAG" ]]` return true, when it should return false on the first time it's hit.
## Additional Info
N/A
Co-authored-by: realbigsean <seananderson33@gmail.com>
## Issue Addressed
Related to: #2259
Made an attempt at all the necessary updates here to publish the crates to crates.io. I incremented the minor versions on all the crates that have been previously published. We still might run into some issues as we try to publish because I'm not able to test this out but I think it's a good starting point.
## Proposed Changes
- Add description and license to `ssz_types` and `serde_util`
- rename `serde_util` to `eth2_serde_util`
- increment minor versions
- remove path dependencies
- remove patch dependencies
## Additional Info
Crates published:
- [x] `tree_hash` -- need to publish `tree_hash_derive` and `eth2_hashing` first
- [x] `eth2_ssz_types` -- need to publish `eth2_serde_util` first
- [x] `tree_hash_derive`
- [x] `eth2_ssz`
- [x] `eth2_ssz_derive`
- [x] `eth2_serde_util`
- [x] `eth2_hashing`
Co-authored-by: realbigsean <seananderson33@gmail.com>
