Create one ephemeral environment per Pull Request
It will allow to test every branch.

See how it's done in moonlanding:
- https://github.com/huggingface/moon-landing/blob/main/.github/workflows/docker.yml#L68: one domain per branch, calling Helm from GitHub action
- https://github.com/huggingface/moon-landing/blob/main/.github/workflows/ephemeral-clean.yml: remove the objects once the PR is merged
- https://github.com/huggingface/moon-landing/blob/main/.github/workflows/docker.yml#L71 : clean the ephemeral objects after two days
Create one ephemeral environment per Pull Request: It will allow to test every branch.

See how it's done in moonlanding:
- https://github.com/huggingface/moon-landing/blob/main/.github/workflows/docker.yml#L68: one domain per branch, calling Helm from GitHub action
- https://github.com/huggingface/moon-landing/blob/main/.github/workflows/ephemeral-clean.yml: remove the objects once the PR is merged
- https://github.com/huggingface/moon-landing/blob/main/.github/workflows/docker.yml#L71 : clean the ephemeral objects after two days