uninstall current emulators

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

src/context.ts

@@ -4,6 +4,7 @@ import {Util} from '@docker/actions-toolkit/lib/util.js';
 export interface Inputs {
   image: string;
   platforms: string;
+  reset: boolean;
   cacheImage: boolean;
 }
 
@@ -11,6 +12,7 @@ export function getInputs(): Inputs {
   return {
     image: core.getInput('image') || 'docker.io/tonistiigi/binfmt:latest',
     platforms: Util.getInputList('platforms').join(',') || 'all',
+    reset: core.getBooleanInput('reset'),
     cacheImage: core.getBooleanInput('cache-image')
   };
 }

src/main.ts

@@ -44,6 +44,18 @@ actionsToolkit.run(
       });
     });
 
+    if (input.reset) {
+      await core.group(`Uninstalling current emulators`, async () => {
+        await Docker.getExecOutput(['run', '--rm', '--privileged', input.image, '--uninstall', 'qemu-*'], {
+          ignoreReturnCode: true
+        }).then(res => {
+          if (res.stderr.length > 0 && res.exitCode != 0) {
+            throw new Error(res.stderr.match(/(.*)\s*$/)?.[0]?.trim() ?? 'unknown error');
+          }
+        });
+      });
+    }
+
     await core.group(`Installing QEMU static binaries`, async () => {
       await Docker.getExecOutput(['run', '--rm', '--privileged', input.image, '--install', input.platforms], {
         ignoreReturnCode: true