feat(dashmate): add epochTime to abci config

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Issue being fixed or feature implemented

#1467 adds the EPOCH_TIME_LENGTH_S setting to the drive_abci service

What was done?

Modify compose file, config schema and migrations

How Has This Been Tested?

Locally

Breaking Changes

None

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone