test: move git remoteSha api test to integration

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

__tests__/git.test.itg.ts

@@ -0,0 +1,25 @@
+/**
+ * Copyright 2026 actions-toolkit authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {describe, expect, it} from 'vitest';
+
+import {Git} from '../src/git.js';
+
+describe('remoteSha', () => {
+  it('returns sha using github api', async () => {
+    expect(await Git.remoteSha('https://github.com/docker/buildx.git', 'refs/pull/648/head', process.env.GITHUB_TOKEN)).toEqual('f11797113e5a9b86bd976329c5dbb8a8bfdfadfa');
+  });
+});