[recommendation]: replace debian base image with alpine image

[Red-GV]

Changes

This PR updates the Python based images to a distroless image as the final base image instead of the existing slim-bookworm. This results in a smaller image overall.

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.

[Red-GV]

The image sizes of the resulting images are documented below:

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.

[julianocosta89]

When running this PR, I got the following error on load-generator:

exec /venv/bin/locust: no such file or directory

And this on recommendation:

exec /venv/bin/opentelemetry-instrument: no such file or directory

[Red-GV]

Heya @julianocosta89 , sorry about that. I had missed that when I created the PR.

I began looking a bit more in the distroless repository and it looks like making the virtual environment work is not as straight forward as I thought. Seems like also alpine is a bit thorny in this arena as well. I'll opt to turn this into a draft and if I cannot find a clean alternative, I will close this PR.

Thanks for your time.

[Red-GV]

Still working on load generator. Here is the results of using Alpine for recommendation service. Seems to be working with my testing. I did need to bump the grpcio package in order to make it build for this distro.

[Red-GV]

After some digging, I found this issue which indicates that the playwright plugin is not available in Alpine. I did add a new stage in order to remove some of the libraries that were only used in build phase, which decreased the size by a little.

[Red-GV]

@julianocosta89 This PR should be ready for review now. Please see my comments above for new image sizes and changes made.

[julianocosta89]

@Red-GV I've tested locally and I'm still not able to run the load-generator.

No logs this time, just:
load-generator exited with code 1

[Red-GV]

Okay, considering that the base image has not changed, I'll opt to drop the changes out of load-generator. Sorry for the back and forth, @julianocosta89 .

[julianocosta89]

LGTM

thx for bearing with me @Red-GV!