feat: add the ability to run with '--production' (#75)

* feat: add the ability to run with '--production'

Adding the config options to run npm audit with the --production flag.

Contributes to: #74

Signed-off-by: Stelios Gkiokas <s_giokas@hotmail.com>

* fix: add tests

Adding the relevant tests for the new production flag.

Contributes to: #74

Signed-off-by: Stelios Gkiokas <s_giokas@hotmail.com>

__tests__/main.test.ts

@@ -15,6 +15,7 @@ describe('run', () => {
     mocked(pr).createComment.mockClear()
 
     process.env.INPUT_AUDIT_LEVEL = 'low'
+    process.env.INPUT_PRODUCTION_FLAG = 'false'
     process.env.INPUT_GITHUB_CONTEXT =
       '{ "event_name": "pull_request", "event": { "number": 100} }'
     process.env.INPUT_GITHUB_TOKEN = '***'