fix: make deploy a slice, use it to config multiple environments

[hbjydev]

Changes

• Adds the ability to configure multiple environments to deploy to with the parameters.deploy configuration.

Example Config

---
projectName: hello
template: go-lambda
parameters:
  deploy:
    - environment: dev
    - environment: prod

Generates as:

deploy:
  - environment: dev
    account: '677459762413'
    region: 'us-west-2'
    roleArn: 'arn:aws:iam::677459762413:role/altf4llc-gha-hello-deploy-dev'
  - environment: prod
    account: '677459762413'
    region: 'us-west-2'
    roleArn: 'arn:aws:iam::677459762413:role/altf4llc-gha-hello-deploy-prod'

Note that account, region and roleArn are defaulted and/or customized by other config parameters like projectName.