Use context for inputs

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

src/context.ts

@@ -0,0 +1,19 @@
+import * as core from '@actions/core';
+import {issueCommand} from '@actions/core/lib/command';
+
+export interface Inputs {
+  image: string;
+  platforms: string;
+}
+
+export function getInputs(): Inputs {
+  return {
+    image: core.getInput('image') || 'tonistiigi/binfmt:latest',
+    platforms: core.getInput('platforms') || 'all'
+  };
+}
+
+// FIXME: Temp fix https://github.com/actions/toolkit/issues/777
+export function setOutput(name: string, value: unknown): void {
+  issueCommand('set-output', {name}, value);
+}