Build smoke-test-fake-backend Docker image for arm64 architecture (#14387)

Author: jaydeluca

smoke-tests/images/fake-backend/build.gradle.kts

@@ -22,7 +22,19 @@ val extraTag = findProperty("extraTag")
 val repo = System.getenv("GITHUB_REPOSITORY") ?: "open-telemetry/opentelemetry-java-instrumentation"
 
 jib {
-  from.image = "gcr.io/distroless/java-debian10:11"
+  from {
+    image = "eclipse-temurin:21-jre"
+    platforms {
+      platform {
+        architecture = "amd64"
+        os = "linux"
+      }
+      platform {
+        architecture = "arm64"
+        os = "linux"
+      }
+    }
+  }
   to.image = "ghcr.io/$repo/smoke-test-fake-backend:$extraTag"
 }
 
@@ -55,8 +67,6 @@ tasks {
     }
   }
 
-  val repo = System.getenv("GITHUB_REPOSITORY") ?: "open-telemetry/opentelemetry-java-instrumentation"
-
   val windowsBackendImageBuild by registering(DockerBuildImage::class) {
     dependsOn(windowsBackendImagePrepare)
     inputDir.set(backendDockerBuildDir)

smoke-tests/images/fake-backend/src/docker/backend/windows.dockerfile

@@ -1,3 +1,3 @@
-FROM eclipse-temurin:11.0.27_6-jdk-windowsservercore-ltsc2022@sha256:5469ceab8d1f5cc620818109fb2e7e2b56bbe010257240348011e16557f9e2b7
+FROM eclipse-temurin:21-jdk-windowsservercore-ltsc2022@sha256:87e4af970a21c3a1eb37b39c42621308f71e16cf95bbfbc8e66ad77d6582b1a3
 COPY fake-backend.jar /fake-backend.jar
 CMD ["java", "-jar", "/fake-backend.jar"]