chore: add missing SPDX ID and workflow check (#13570)

* chore: add workflow which checks if SPDX ID exists

* chore: add missing SPDX ID in some files

* chore: change trigger condition

* chore: trigger on push

* lint

scripts/changelog-checker/test/checker.test.ts

@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
 import {expect, suite, test} from "vitest";
 import {Release, ReleaseCategory} from "../src/parser";
 import {checkNewRelease, checkNewTopic} from "../src/checker";
@@ -411,4 +416,4 @@ suite('checkNewTopic', () => {
 		console.log(result.message)
 		expect(result.success).toBe(false)
 	})
-})
+})