fixup! Run PR validation on multiple OS

Author: skarpovdev

kotlin-sdk-test/src/jvmTest/kotlin/io/modelcontextprotocol/kotlin/sdk/integration/typescript/TsTestBase.kt

@@ -143,7 +143,7 @@ abstract class TsTestBase {
     // ===== TypeScript Server (SSE/HTTP) =====
     protected fun startTypeScriptServer(port: Int): ContainerProcess {
         val container = GenericContainer(tsDockerImage()).apply {
-            withImagePullPolicy(PullPolicy.defaultPolicy())
+            withImagePullPolicy(PullPolicy.alwaysPull())
             withExposedPorts(port)
             mapOf(
                 "MCP_HOST" to "0.0.0.0",

kotlin-sdk-test/src/jvmTest/kotlin/io/modelcontextprotocol/kotlin/sdk/integration/utils/Dockerfile

@@ -1,6 +1,6 @@
 # Docker image for running TypeScript SDK test servers/clients with SSE over HTTP and STDIO
 
-FROM node:20-alpine AS base
+FROM --platform=linux/amd64 node:20-alpine AS base
 
 # 1) System deps
 RUN apk add --no-cache git