Make running the example a trivial process

[mesaugat]

Following changes have been made to make the example easier to run.

• Bump sync-db version to ^1.0.0-beta.10
• Remove babel and unwanted dev dependencies
• Include PostgreSQL database credentials in docker-compose.yml for ease of use
• Remove connections.sync-db.json.docker.example
• Use postgres:13-alpine and node:14-slim to reduce container size
• Bump knex and pg to latest versions
• Update index.js to support new return values from upgraded version of knex
• Update SQL functions to work properly with PostgreSQL database
• Add README.md with details on how to run the example

Sample output with docker:

example-app | yarn run v1.22.5
example-app | $ /app/node_modules/.bin/sync-db synchronize
example-app | Synchronizing...
example-app |
example-app |  ▸ db1
example-app |    [✓] Synchronization - started
example-app |    [✓] Synchronization - pruned (0s)
example-app |    [✓] Migrations - up to date (0.02s)
example-app |    [✓] Synchronization - completed (0.13s)
example-app |
example-app | Synchronization complete for 1 / 1 connection(s). (0.25s)
example-app |
example-app | Done in 0.54s.
example-app | yarn run v1.22.5
example-app | $ node src/index.js
example-app |
example-app | List of table names in the database:
example-app |  [ 'knex_migrations', 'knex_migrations_lock', 'users', 'todos' ]
example-app |
example-app | List of user names in the database:
example-app |  [ 'sync' ]
example-app |
example-app | Calculations:
example-app |  { 'Sum of 6 and 7': 13, 'Square of 6': 36, 'Product of 6 and 7': 42 }
example-app |
example-app | Current date time: 2021-03-21T00:00:00.000Z
example-app | Done in 0.11s.
example-app exited with code 0

[samirsilwal]

😆