[chore] Move dependencies control to .env file

[julianocosta89]

Changes

A couple of dependencies had to be updated in multiple places, this PR moves all of them to .env file.

Merge Requirements

For new features contributions, please make sure you have completed the following
essential items:

• CHANGELOG.md updated to document new feature additions
• Appropriate documentation updates in the docs
• Appropriate Helm chart updates in the helm-charts

Maintainers will not merge until the above have been completed. If you're unsure
which docs need to be changed ping the
@open-telemetry/demo-approvers.

[julianocosta89]

build_images is not using docker compose 😞

I'm open to suggestions, because I strongly believe we should have a centralised place to manage the versions.

As of today we have to update 3 files every time the java agent updates.
2 places every time there is an update to opensearch or tracetest.

[rogercoll]

.env FTW! I like the idea of controlling as much as possible the versions from a single file

[rogercoll]

build_images is not using docker compose 😞

Could this be changed to use docker compose build? 🤔 I agree that relying on a single dependencies file would ease the maintenance

[julianocosta89]

Unfortunately I'm not a Github actions expert.
I've googled a bit around and I'm still not sure.

We have this in the GH marketplace: https://github.com/marketplace?query=docker+compose
But only 5 of those are verified and none of those 5 do what we need here.

@puckpuck any ideas/suggestions?