Sequencer 0.4.0

Joroshiba/release take 2 (#421)

## Summary
Revert of revert + fix for release changes

## Background
Previously pushed changes to update release flows, it didn't work, and
the nature of tests was such that rollback and redeploy with fix is best
option.

## Changes
- Everything from astriaorg/astria#413 + fix around base ref not
existing