v1/platforms cannot be built

crates/spk-cli/cmd-make-binary/src/cmd_make_binary_test.rs

@@ -81,3 +81,42 @@ build:
         .await
         .expect("With override, build script should succeed.");
 }
+
+#[rstest]
+#[case::v0("v0/platform")]
+#[case::v1("v1/platform")]
+#[tokio::test]
+async fn build_a_platform(tmpdir: tempfile::TempDir, #[case] api: &str) {
+    let _rt = spfs_runtime().await;
+
+    let filename = tmpdir.path().join("simple.spk.yaml");
+    {
+        let mut file = File::create(&filename).unwrap();
+        file.write_all(
+            format!(
+                r#"
+platform: demo-platform/1.0.0
+api: {api}
+requirements: []
+"#
+            )
+            .as_bytes(),
+        )
+        .unwrap();
+    }
+
+    let filename_str = filename.as_os_str().to_str().unwrap();
+
+    // First, don't override the variable on the command line (test the test).
+    let mut opt = Opt::try_parse_from([
+        "make-binary",
+        // Don't exec a new process to move into a new runtime, this confuses
+        // coverage testing.
+        "--no-runtime",
+        "--disable-repo=origin",
+        "--here",
+        filename_str,
+    ])
+    .unwrap();
+    opt.mkb.run().await.expect("Build should succeed.");
+}