fix: buildJobSpec/buildWorkerSpec — accept structured map image shape (parity with parent service)

[Copilot]

buildJobSpec and buildWorkerSpec only parsed the image field as a string via ParseImageRef, silently dropping the structured map form and causing DO API rejections ("job missing source spec"). The parent service already handled both shapes via imageSpecFromConfig.

Changes

• app_platform_buildspec.go — replace inline strFromConfig + ParseImageRef in buildJobSpec and buildWorkerSpec with imageSpecFromConfig, which accepts both string and map shapes:

// Before
if imgStr := strFromConfig(m, "image", ""); imgStr != "" {
    img, err := ParseImageRef(imgStr)
    if err == nil {
        job.Image = img
    }
}

// After
if img, err := imageSpecFromConfig(m); err == nil {
    job.Image = img
}

• app_platform_buildspec_test.go — adds coverage for structured map, string, and empty image for both jobs and workers:
  • TestBuildAppSpec_Jobs_ImageMapShape / TestBuildAppSpec_Workers_ImageMapShape
  • TestBuildAppSpec_Jobs_ImageStringShape / TestBuildAppSpec_Workers_ImageStringShape (regression)
  • TestBuildAppSpec_Jobs_ImageEmpty / TestBuildAppSpec_Workers_ImageEmpty (regression)

The structured map form now works on jobs and workers the same way it does on services:

image:
  registry_type: DOCKER_HUB
  repository: library/postgres
  tag: "18"

[Copilot]

Pull request overview

This PR fixes App Platform build spec generation so buildJobSpec and buildWorkerSpec accept the image field in both supported canonical shapes—either a flat string image ref or a structured map[string]any—matching the behavior already used for the primary service image. This prevents structured image configs from being silently ignored for jobs/workers, which can lead to downstream DigitalOcean API rejections.

Changes:

• Updated buildJobSpec and buildWorkerSpec to use imageSpecFromConfig (string-or-map) instead of only parsing string image refs.
• Added tests covering job/worker image handling for structured map shape, string shape (regression), and missing image (regression).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
internal/drivers/app_platform_buildspec.go	Switch job/worker image parsing to imageSpecFromConfig to support both string and structured map image shapes.
internal/drivers/app_platform_buildspec_test.go	Add coverage for job/worker image parsing across map/string/empty cases.

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