hosting-cli(gcp): add --cpu, --memory, --min-instances flags

[Kastier1]

Summary

• Adds --cpu, --memory, and --min-instances flags to reflex deploy --gcp. They forward to the deploy script via CPU, MEMORY, and MIN_INSTANCES env vars.
• The restricted env in _run_deploy_script (allowlist-only) means callers couldn't override these from their shell — they have to come through CLI flags.
• Defaults match the previously hard-coded values (1 / 1Gi / 1), so the no-args behavior is unchanged.
• Requires the matching backend change so the script honors the new env vars: reflex-dev/flexgen#3735

Test plan

• pytest tests/units/reflex_cli/v2/test_gcp.py (22 passed locally, includes 2 new tests covering custom values and defaults)
• Smoke deploy with --cpu 2 --memory 2Gi --min-instances 0 once the flexgen PR is merged, and confirm the rendered gcloud run deploy line uses them.

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR adds --cpu, --memory, and --min-instances CLI flags to reflex deploy --gcp, forwarding them as CPU, MEMORY, and MIN_INSTANCES environment variables into the deploy script. Defaults (1, 1Gi, 1) match the previously hard-coded values, so existing behavior is unchanged.

• New flags are wired through deploy_command into deploy_env and passed via env_overrides to _run_deploy_script, following the same pattern as existing env vars like GCP_PROJECT and VERSION.
• Two new unit tests verify both custom values and default passthrough for the new flags.

Confidence Score: 4/5

Safe to merge; the new flags follow existing patterns and defaults preserve current behavior, with the only risk being invalid user input surfacing later inside gcloud rather than at the CLI.

The implementation is straightforward and correct. The only concerns are that --min-instances accepts any string (negative numbers, non-integers) and --cpu/--memory have no format validation, meaning bad input passes through to gcloud silently. These are UX gaps, not functional regressions.

The --cpu and --memory option declarations in gcp.py (lines 143–161) would benefit from input validation before the PR is merged.

Important Files Changed

Filename	Overview
packages/reflex-hosting-cli/src/reflex_cli/v2/gcp.py	Adds --cpu, --memory, --min-instances CLI options forwarded as env vars to the deploy script; no input validation on the new flags.
tests/units/reflex_cli/v2/test_gcp.py	Adds two new tests covering custom flag values and default values for the new resource flags; both are well-structured and complete.

_{Reviews (1): Last reviewed commit: "hosting-cli(gcp): add --cpu, --memory, -..." | Re-trigger Greptile}

[codspeed-hq]

Merging this PR will not alter performance

✅ 24 untouched benchmarks

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_{Comparing simon/gcp-cloud-run-resources (894e1b0) with main (6bb44d5)}