test: provide a mock implementation of Octokit

This avoids the new error when running the tests:

  TypeError: rest_1.Octokit is not a constructor

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

__mocks__/@octokit/rest.js

@@ -0,0 +1,54 @@
+module.exports = {
+    __esModule: true,
+    Octokit: jest.fn().mockImplementation(() => {
+        return {
+            actions: {
+                listWorkflowRuns: jest.fn().mockResolvedValue({
+                    data: {
+                        workflow_runs: [
+                            {
+                                head_sha: 'mock_sha'
+                            }
+                        ]
+                    }
+                }),
+                listWorkflowRunArtifacts: jest.fn().mockResolvedValue({
+                    data: {
+                        artifacts: [
+                            {
+                                name: 'git-sdk-64-build-installers',
+                                id: 12345,
+                                created_at: '2025-08-12T12:00:00Z'
+                            }
+                        ]
+                    }
+                }),
+                downloadArtifact: jest.fn().mockResolvedValue({
+                    data: 'mock artifact content'
+                })
+            },
+            repos: {
+                getBranch: jest.fn().mockResolvedValue({
+                    data: {
+                        commit: {
+                            sha: 'mock_sha'
+                        }
+                    }
+                }),
+                listReleases: jest.fn().mockResolvedValue({
+                    data: [
+                        {
+                            tag_name: 'v2.41.0.windows.1',
+                            assets: [
+                                {
+                                    name: 'git-sdk-64-build-installers.7z',
+                                    browser_download_url: 'https://example.com/git-sdk-64-build-installers.7z'
+                                }
+                            ]
+                        }
+                    ]
+                })
+            }
+        }
+    })
+}