This Commit allows us to:
* Test the `CaptureHead` function.
* Test parsing a single Head message.
* Test a Reorg condition.
* Add Metrics. This is primarily used for testing but can have future use cases.
* Rearrange the test due to race conditions introduced by reusing a variable. `BeforeEach` can't be used to update `BC`.
* -- Intermediary Commit --
Just want to commit my code over the weekend, in case I spill coffee on my workstation.
* Create DB models ready for write.
* Handle SSE events
* Update ref for stack-orchestrator
* Use env in one place only.
* Boot Application on PR
* Update syntax
* Update syntax
* Correct command
* Use bash instead of sh
* Use until instead of while
* Make linter happy and check sse subscription err
* Handle Reorgs - Untested
