feat(cli): enable remote-sandbox sends one custom image for every matching cloud

client-sdks/platform/rust/tests/remote_sandbox_azure_registry_image.rs

@@ -0,0 +1,49 @@
+use alien_platform_api::types::Project;
+use serde_json::json;
+
+// A public custom image with a linux/amd64 variant runs on Azure from its registry digest, so the
+// saved Azure half names a `registryImage` and no `catalogImage`.
+fn project_with_a_custom_image_on_azure() -> serde_json::Value {
+    json!({
+        "id": "prj_aaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+        "name": "my-app",
+        "createdAt": "2026-09-30T00:00:00Z",
+        "workspaceId": "ws_AAAAAAAAAAAAAAAAAAAAAAAA",
+        "projectCapabilities": {
+            "schemaVersion": 1,
+            "capabilities": {
+                "remoteSandbox": {
+                    "enabled": true,
+                    "customImage": "docker.io/library/python:3.12",
+                    "baseImage": "docker.io/library/python@sha256:aaa",
+                    "maxLifetimeSeconds": 3600,
+                    "azure": {
+                        "registryImage": "docker.io/library/python@sha256:bbb",
+                        "idleSuspendSeconds": 900
+                    }
+                }
+            }
+        }
+    })
+}
+
+#[test]
+fn decodes_an_azure_half_with_a_registry_image_and_no_catalog_image() {
+    let project: Project = serde_json::from_value(project_with_a_custom_image_on_azure())
+        .expect("project decodes");
+    let azure = project
+        .project_capabilities
+        .expect("capabilities decode")
+        .capabilities
+        .remote_sandbox
+        .expect("remote sandbox decodes")
+        .azure
+        .expect("azure decodes");
+
+    assert_eq!(
+        azure.registry_image.as_ref().map(|image| image.as_str()),
+        Some("docker.io/library/python@sha256:bbb")
+    );
+    assert!(azure.catalog_image.is_none());
+    assert_eq!(azure.idle_suspend_seconds.get(), 900);
+}