feat(api): add spec.workspaceSize to BuildJob for configurable PVC size

[ambient-code]

PR Description

Summary

Add spec.workspaceSize to BuildJob so users can configure the build workspace PVC size per job.

Fixes #29

---

Problem

The build workspace PVC size was hardcoded to 10Gi in internal/tekton/pipelinerun_builder.go. This is fine for MCU/Zephyr builds but far too small for AAOS/AOSP builds that need 500+ GB. There was no way to override it without patching the operator binary.

Solution

Added WorkspaceSize *resource.Quantity to BuildJobSpec. The pipeline builder reads it and substitutes it into the volumeClaimTemplate; when nil, it falls back to "10Gi". No changes to existing BuildJob resources are needed.

Changes

File	Change
api/v1alpha1/buildjob_types.go	New WorkspaceSize *resource.Quantity field
api/v1alpha1/zz_generated.deepcopy.go	Deepcopy for new pointer field
internal/tekton/pipelinerun_builder.go	Replace hardcoded "10Gi" with field value
config/crd/bases/builder.sdv.cloud.redhat.com_buildjobs.yaml	CRD schema updated
internal/tekton/pipelinerun_builder_test.go	Two new regression tests

Testing

ok  github.com/centos-automotive-suite/bob/api/v1alpha1       (all pass)
ok  github.com/centos-automotive-suite/bob/cmd/bob            (all pass)
ok  github.com/centos-automotive-suite/bob/internal/buildapi  (all pass)
ok  github.com/centos-automotive-suite/bob/internal/tekton    (35 tests, +2 new, all pass)

New regression tests:

• TestBuildPipelineRun_WorkspaceSize_Custom — 500Gi is propagated to the PVC
• TestBuildPipelineRun_WorkspaceSize_DefaultWhenNil — nil falls back to 10Gi

Example

spec:
  workspaceSize: 500Gi   # new field
  toolchain:
    image: registry.example.com/aaos-host-tools:android-14
  source:
    type: git
    git:
      url: https://github.com/example/aaos-manifest
  stages:
    - name: build
      command: "make"

Reviewer Notes

• The gofmt run also re-aligned the annotations map in buildOCIArtifactTask (whitespace only, no logic change).
• The CRD YAML is hand-maintained in this project (the make manifests target prints a notice rather than running controller-gen). The workspaceSize field uses type: string, matching the project's existing convention for timeout.