refactor: to node action (#47)

Refactoring the action from a composite to Node action. This change improves security through pinning of packages as well as better test-ability and error handling.

Reviewed-on: #47
Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-committed-by: Timo Behrendt <t.behrendt@t00n.de>

src/main.ts

@@ -0,0 +1,18 @@
+import * as core from "@actions/core";
+import { readFileSync } from "node:fs";
+import { validateJson } from "./validation";
+
+export async function run(): Promise<void> {
+  try {
+    const jsonFilePath = core.getInput("json-file");
+    core.info(`Validating JSON file: ${jsonFilePath}`);
+
+    const json = readFileSync(jsonFilePath, "utf8");
+
+    await validateJson(json);
+
+    core.info("JSON file is valid");
+  } catch (error) {
+    core.setFailed(`Error validating JSON file: ${error}`);
+  }
+}