Add linuxArm64 support

Author: trueangle

lambda-events/build.gradle.kts

@@ -4,7 +4,8 @@ plugins {
 }
 
 kotlin {
-    linuxX64()
+    val isArm64 = System.getProperty("os.arch") == "aarch64"
+    val nativeTarget = if (isArm64) linuxArm64() else linuxX64()
 
     sourceSets {
         commonMain.dependencies {

lambda-runtime/build.gradle.kts

@@ -4,7 +4,8 @@ plugins {
 }
 
 kotlin {
-    linuxX64()
+    val isArm64 = System.getProperty("os.arch") == "aarch64"
+    val nativeTarget = if (isArm64) linuxArm64() else linuxX64()
 
     sourceSets {
         commonMain.dependencies {

sample/build.gradle.kts

@@ -5,14 +5,12 @@ plugins {
 
 // todo is it a right way to specify main entry point for linux64?
 kotlin {
+    val isArm64 = System.getProperty("os.arch") == "aarch64"
+    val nativeTarget = if (isArm64) linuxArm64() else linuxX64()
 
-    listOf(
-        linuxX64()
-    ).forEach {
-        it.binaries {
-            executable {
-                entryPoint = "com.github.trueangle.knative.lambda.runtime.sample.main"
-            }
+    nativeTarget.binaries {
+        executable {
+            entryPoint = "com.github.trueangle.knative.lambda.runtime.sample.main"
         }
     }