Add node_modules necessary for action release

node_modules/@actions/exec/lib/exec.d.ts

@@ -0,0 +1,12 @@
+import * as im from './interfaces';
+/**
+ * Exec a command.
+ * Output will be streamed to the live console.
+ * Returns promise with return code
+ *
+ * @param     commandLine        command to execute (can include additional args). Must be correctly escaped.
+ * @param     args               optional arguments for tool. Escaping is handled by the lib.
+ * @param     options            optional exec options.  See ExecOptions
+ * @returns   Promise<number>    exit code
+ */
+export declare function exec(commandLine: string, args?: string[], options?: im.ExecOptions): Promise<number>;