feat : Add SDK support for YAML-based deployments via deploy_from_yaml

[harsh21234i]

Summary

I was exploring this issue and noticed that YAML-based deployments are currently only available through the CLI. This PR adds a simple SDK function deploy_from_yaml so the same thing can be done directly from Python.

What I did

• Added a new function deploy_from_yaml(path: str)
• Reused the existing YAML parsing logic from the CLI
• Created deployments using RunnerDeployment and called .apply()
• Exposed the function via prefect.deployments

Why this change

Right now, if someone wants to use prefect.yaml inside a Python workflow, they either have to call the CLI or use internal/private methods. This felt like a gap since most of the logic already exists — it just isn’t exposed in the SDK.

This PR basically bridges that gap in a simple way.

Example

from prefect.deployments import deploy_from_yaml

deploy_from_yaml("prefect.yaml")

Notes

• I reused _load_deploy_configs_and_actions to avoid duplicating parsing logic
• Used a small DummyConsole to avoid CLI-specific behavior
• Kept this version minimal (no interactive prompts, build/push steps, etc.)

Future improvements (optional)

• Move YAML parsing out of CLI into a shared module
• Support more advanced features like build/push steps
• Improve async handling

Closes #19503

[codspeed-hq]

Merging this PR will not alter performance

✅ 2 untouched benchmarks

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_{Comparing harsh21234i:feat/deploy-from-yaml-sdk (8cbedac) with main (31b93ed)}