[Test Containers] Auto Deploy ephemeral staging environment on PR for YRAL Services

[Natasha-GB]

Relevant Repos:
https://github.com/go-bazzinga/hot-or-not-web-leptos-ssr/tree/rupansh/testcontainers
https://github.com/go-bazzinga/hot-or-not-backend-canister/tree/rupansh/container
https://github.com/go-bazzinga/yral-metadata/tree/rupansh/grpc
https://github.com/go-bazzinga/off-chain-agent

Previously Done:
#248
Containerize Backend Canisters
Containerize Yral-Metadata
Setup an initial feed in the backend canisters container
Auto upload containers to ghrc.io (github container registry)

This task is for:
Estimated Effort: 2-3 days
Auto Deploy ephemeral staging environment on PR --> Proposal, To be discussed and thought more
Current blockers (These mainly prevent us from merging to main branch, but do not block further progress)

Graceful exits in cargo leptos: leptos-rs/cargo-leptos#316 PR is made
Lazily fetch node root keys from IC in agent-rs: dfinity/agent-rs#569