temporary blockchain txn_mgr

• Moves to a temporary blockchain core branch to make payment
  transaction processing more reliable while we work on
  improving their performance

first block performance

• Makes first_block part of the account and gateway ledger instead of
  looking them up on every row insert. This speeds up block processing.

• Makes .env optional for systems where the environment variables are
  supplied otherwise

Transaction Actor Blocks

Changes

• Adds a block column to the transaction_actor table. This allows for "what actors in a block" kind of queries and opens the door for some trials around improved join speeds with the transactions table.

• Adds the ability to specify the location of the .env file. The prod release profile uses this to set the location to where the application data is located (/var/data/blockchain_etl). This change will not affect dev or local profiles

Migration

This release requires a migration, but no reset is required:

• Stop the existing etl application
• Run ./bin/blockchain_etl migrations run. This migration will take a long time. In the order of 20-30 minutes .
• Start the etl application