🎉 Added optional platform flag for build image script (#6000)

docs/connector-development/tutorials/building-a-java-destination.md

@@ -51,6 +51,13 @@ You can build the destination by running:
 ./gradlew :airbyte-integrations:connectors:destination-<name>:build
 ```
 
+On Mac M1(Apple Silicon) machines(until openjdk images natively support ARM64 images) set the platform variable as shown below and build
+```bash
+export DOCKER_BUILD_PLATFORM=linux/amd64
+# Must be run from the Airbyte project root
+./gradlew :airbyte-integrations:connectors:destination-<name>:build
+```
+
 this compiles the java code for your destination and builds a Docker image with the connector. At this point, we haven't implemented anything of value yet, but once we do, you'll use this command to compile your code and Docker image. 
 
 {% hint style="info" %}

tools/bin/build_image.sh

@@ -39,5 +39,9 @@ if [ "$FOLLOW_SYMLINKS" == "true" ]; then
   # to use as the build context
   tar cL "${exclusions[@]}" . | docker build - "${args[@]}"
 else
-  docker build . "${args[@]}"
+  if [[ -z "${DOCKER_BUILD_PLATFORM}" ]]; then
+    docker build . "${args[@]}"
+  else
+    docker build --platform="$DOCKER_BUILD_PLATFORM" . "${args[@]}"
+  fi
 fi