From 50da33712b937eddb6e98003acbdc05997e2baad Mon Sep 17 00:00:00 2001
From: Adam Moussa <166072409+amoussa1229@users.noreply.github.com>
Date: Fri, 8 May 2026 17:58:28 -0400
Subject: [PATCH] Set explicit arm64 platform on Docker image build (#30)
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fromAsset() builds for the host architecture by default. On x86_64
GitHub Actions runners, this produces an x86 image even with QEMU
installed — the Fargate ARM64 task then fails with exec format error.
---
 lib/constructs/socket-mode.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/constructs/socket-mode.ts b/lib/constructs/socket-mode.ts
index bdf2d98..ff0a1fe 100644
--- a/lib/constructs/socket-mode.ts
+++ b/lib/constructs/socket-mode.ts
@@ -1,5 +1,6 @@
 import { Construct } from 'constructs';
 import * as ecs from 'aws-cdk-lib/aws-ecs';
+import * as ecr_assets from 'aws-cdk-lib/aws-ecr-assets';
 import * as ec2 from 'aws-cdk-lib/aws-ec2';
 import * as secretsmanager from 'aws-cdk-lib/aws-secretsmanager';
 import * as lambda from 'aws-cdk-lib/aws-lambda';
@@ -37,6 +38,7 @@ export class SocketModeConstruct extends Construct {
     taskDef.addContainer('socket-mode', {
       image: ecs.ContainerImage.fromAsset(
         path.join(__dirname, '../../services/socket-mode'),
+        { platform: ecr_assets.Platform.LINUX_ARM64 },
       ),
       environment: {
         APP_TOKEN_SECRET_ARN: appTokenSecret.secretArn,