ci: skip Miniflare browser CA certificate tests during local testing (#7517)

This test seems to fail on developer machines locally.
Possibly because our WARP setup requires self-signed root CA certificates?

The tests will still run in GitHub so we do not lose test safety. Just the small chance that failures only get picked up at CI test time and not when in development.

Author: petebacondarwin

packages/miniflare/test/index.spec.ts

@@ -1335,20 +1335,24 @@ test("Miniflare: python modules", async (t) => {
 	t.is(await res.text(), "4");
 });
 
-test("Miniflare: HTTPS fetches using browser CA certificates", async (t) => {
-	const mf = new Miniflare({
-		modules: true,
-		script: `export default {
+if (process.env.CI) {
+	// This test seems to fail on developer machines locally.
+	// Possibly because our WARP setup requires self-signed root CA certificates?
+	test("Miniflare: HTTPS fetches using browser CA certificates", async (t) => {
+		const mf = new Miniflare({
+			modules: true,
+			script: `export default {
 			fetch() {
 				return fetch("https://workers.cloudflare.com/cf.json");
 			}
 		}`,
+		});
+		t.teardown(() => mf.dispose());
+		const res = await mf.dispatchFetch("http://localhost");
+		t.true(res.ok);
+		await res.arrayBuffer(); // (drain)
 	});
-	t.teardown(() => mf.dispose());
-	const res = await mf.dispatchFetch("http://localhost");
-	t.true(res.ok);
-	await res.arrayBuffer(); // (drain)
-});
+}
 
 test("Miniflare: accepts https requests", async (t) => {
 	const log = new TestLog(t);