Koa template fails lint on init

[72636c]

We're careful with our templating of the Gantry environment names because they could contain characters like - that are not valid in JavaScript dot notation:

skuba/template/koa-rest-api/src/config.ts

Line 45 in 8f862f5

...configs['<%- prodGantryEnvironmentName %>'](),

The unfortunate side effect is that simple environment names fail initial lint because they should use dot notation:

[ESLint  ] .../src/config.ts
[ESLint  ]   45:16  error  ["prod"] is better written in dot notation  dot-notation
[ESLint  ]
[ESLint  ] ✖ 1 problem (1 error, 0 warnings)
[ESLint  ]   1 error and 0 warnings potentially fixable with the `--fix` option.