feat(orchestrator): add experimental GCP Cloud Run and Azure ACI providers

Add two new cloud provider implementations for the orchestrator, both marked
as experimental:

- **GCP Cloud Run Jobs** (`providerStrategy: gcp-cloud-run`): Executes Unity
  builds as Cloud Run Jobs with GCS FUSE for large artifact storage. Supports
  configurable machine types, service accounts, and VPC connectors. 7 new inputs
  (gcpProject, gcpRegion, gcpBucket, gcpMachineType, gcpDiskSizeGb,
  gcpServiceAccount, gcpVpcConnector).

- **Azure Container Instances** (`providerStrategy: azure-aci`): Executes Unity
  builds as ACI containers with Azure File Shares (Premium FileStorage) for
  large artifact storage up to 100 TiB. Supports configurable CPU/memory,
  VNet integration, and subscription targeting. 9 new inputs
  (azureResourceGroup, azureLocation, azureStorageAccount, azureFileShareName,
  azureSubscriptionId, azureCpu, azureMemoryGb, azureDiskSizeGb, azureSubnetId).

Both providers use their respective CLIs (gcloud, az) for infrastructure
management and support garbage collection of old build resources. No tests
included as these require real cloud infrastructure to validate.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/model/build-parameters.ts

@@ -107,6 +107,26 @@ class BuildParameters {
   public unityHubVersionOnMac!: string;
   public dockerWorkspacePath!: string;
 
+  // GCP Cloud Run (Experimental)
+  public gcpProject!: string;
+  public gcpRegion!: string;
+  public gcpBucket!: string;
+  public gcpMachineType!: string;
+  public gcpDiskSizeGb!: string;
+  public gcpServiceAccount!: string;
+  public gcpVpcConnector!: string;
+
+  // Azure Container Instances (Experimental)
+  public azureResourceGroup!: string;
+  public azureLocation!: string;
+  public azureStorageAccount!: string;
+  public azureFileShareName!: string;
+  public azureSubscriptionId!: string;
+  public azureCpu!: string;
+  public azureMemoryGb!: string;
+  public azureDiskSizeGb!: string;
+  public azureSubnetId!: string;
+
   public static shouldUseRetainedWorkspaceMode(buildParameters: BuildParameters) {
     return buildParameters.maxRetainedWorkspaces > 0 && Orchestrator.lockedWorkspace !== ``;
   }
@@ -228,6 +248,22 @@ class BuildParameters {
       inputPullCommand: OrchestratorOptions.inputPullCommand,
       pullInputList: OrchestratorOptions.pullInputList,
       kubeStorageClass: OrchestratorOptions.kubeStorageClass,
+      gcpProject: Input.gcpProject,
+      gcpRegion: Input.gcpRegion,
+      gcpBucket: Input.gcpBucket,
+      gcpMachineType: Input.gcpMachineType,
+      gcpDiskSizeGb: Input.gcpDiskSizeGb,
+      gcpServiceAccount: Input.gcpServiceAccount,
+      gcpVpcConnector: Input.gcpVpcConnector,
+      azureResourceGroup: Input.azureResourceGroup,
+      azureLocation: Input.azureLocation,
+      azureStorageAccount: Input.azureStorageAccount,
+      azureFileShareName: Input.azureFileShareName,
+      azureSubscriptionId: Input.azureSubscriptionId,
+      azureCpu: Input.azureCpu,
+      azureMemoryGb: Input.azureMemoryGb,
+      azureDiskSizeGb: Input.azureDiskSizeGb,
+      azureSubnetId: Input.azureSubnetId,
       cacheKey: OrchestratorOptions.cacheKey,
       maxRetainedWorkspaces: Number.parseInt(OrchestratorOptions.maxRetainedWorkspaces),
       useLargePackages: OrchestratorOptions.useLargePackages,