Check if buildx available on runner

Use default buildx on runner

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

setup-buildx/src/exec.ts

@@ -0,0 +1,34 @@
+import * as actionsExec from '@actions/exec';
+import {ExecOptions} from '@actions/exec';
+
+export interface ExecResult {
+  success: boolean;
+  stdout: string;
+  stderr: string;
+}
+
+export const exec = async (command: string, args: string[] = [], silent: boolean): Promise<ExecResult> => {
+  let stdout: string = '';
+  let stderr: string = '';
+
+  const options: ExecOptions = {
+    silent: silent,
+    ignoreReturnCode: true
+  };
+  options.listeners = {
+    stdout: (data: Buffer) => {
+      stdout += data.toString();
+    },
+    stderr: (data: Buffer) => {
+      stderr += data.toString();
+    }
+  };
+
+  const returnCode: number = await actionsExec.exec(command, args, options);
+
+  return {
+    success: returnCode === 0,
+    stdout: stdout.trim(),
+    stderr: stderr.trim()
+  };
+};