[awx] Adding extraEnv var

[benjamin-losson-decathlon]

What this PR does / why we need it:

Adding extraEnv var for every containers. We needed that to explicit a certificate path for vault.

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [x] Developer Certificate of Origin signed
• [x] Chart Version bumped (SEMVER 2)
• [x] Variables are documented in the README.md
• [x] Title of the PR starts with chart name (e.g. [example]: Add service for feature xyz)