Use an editable combobox for the Cloud Run region field (DT-4232)

[rossnelson]

What

Replaces the free-text gcpRegion input on the Create Worker Deployment form (Cloud Run provider) with an editable Holocene Combobox, and makes the suggestion list configurable.

• Suggests known GCP Cloud Run regions from a new GCP_REGIONS list.
• Allows a custom region not in the list via allowCustomValue, so an unsupported-by-us region never blocks deployment creation.
• Keeps the field visible and editable (no auto-hide, no forced default). The existing gcp-region-hint is preserved below the field.
• Exposes an optional gcpRegions?: string[] prop, threaded page -> form -> compute-fields, so cloud-ui can pass its own region list. When omitted, the built-in GCP_REGIONS default applies.

Combobox fix

While wiring this up, found a latent bug in the shared Holocene Combobox: addCustomValue unconditionally cleared the input (displayValue = '') after selecting. For single-select this blanked the field even though the value was stored, so a newly added custom value looked unselected. That clear is only meant for multiselect (reset the input for the next chip), so it is now guarded with if (multiselect). The only other allowCustomValue consumer (nexus-form) is multiselect, so this path was never exercised before.

Why

The worker's region is always a GCP (Cloud Run) region, while the Namespace region may be AWS or Azure, so defaulting to the Namespace region is not reliable. Our GetRegions list only covers regions we support for hosting a namespace, not all GCP regions a Cloud Run worker pool can use. This offers helpful suggestions without limiting the user.

Notes

• Skipped the optional Namespace-region pre-fill: the ticket flags the Namespace region as an unreliable GCP default and the plumbing was not warranted.
• No schema change needed; gcpRegion stays a required non-empty string, which allows custom values.

Testing

• pnpm check passes (0 errors)
• pnpm lint passes (0 errors)

Jira: DT-4232

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Project	Deployment	Actions	Updated (UTC)
holocene	Ready	Preview, Comment	Jul 7, 2026 7:50pm

[temporal-cicd]

Warnings

⚠️

📊 Strict Mode: 10 errors in 1 file (1.2% of 858 total) src/lib/holocene/combobox/combobox.svelte (10) L154:4: Type 'null' is not assignable to type 'string'. L157:4: Type 'null' is not assignable to type '"search" | "link" | "success" | "error" | "action" | "activity" | "add-square" | "add" | "apple" | "archives" | "arrow-down" | "arrow-left" | "arrow-up" | "arrow-right" | "ascending" | ... 146 more ... | "xmark-square"'. L159:4: Type 'null' is not assignable to type 'keyof T'. L244:4: 'inputElement' is possibly 'null'. L245:4: 'inputElement' is possibly 'null'. L251:14: Argument of type 'string | T | undefined' is not assignable to parameter of type 'string | T'. L256:14: Argument of type 'string | T | undefined' is not assignable to parameter of type 'string | T'. L302:60: Function lacks ending return statement and return type does not include 'undefined'. L395:10: Type 'HTMLLIElement | null' is not assignable to type 'HTMLLIElement'. L395:43: 'menuElement' is possibly 'null'.

Generated by 🚫 dangerJS against 2d986ce

[tegan-temporal]

how come this is a copy? does it get mutated somewhere?

[rossnelson]

It does, the user can a region that is not shown in the list. since its a static list, it made sense to also allow freeform input.