chore: update build to output directly to path (#410)

* update `Dockerfile` and `build_layers.sh`

updated script to output directly on build, allowing me to run this locally and in a gitlab job

* uncomment needed changes

Author: duncanista

Dockerfile

@@ -1,5 +1,5 @@
 ARG image
-FROM $image
+FROM $image as builder
 
 ARG runtime
 
@@ -23,3 +23,6 @@ RUN find . -name '*.so' -exec strip -g {} \;
 RUN rm -rf ./python/lib/$runtime/site-packages/botocore*
 RUN rm -rf ./python/lib/$runtime/site-packages/setuptools
 RUN rm -rf ./python/lib/$runtime/site-packages/jsonschema/tests
+
+FROM scratch
+COPY --from=builder /build/python /

scripts/build_layers.sh

@@ -49,12 +49,8 @@ function docker_build_zip {
         --build-arg image=python:$1 \
         --build-arg runtime=python$1 \
         --platform linux/${arch} \
-        --load
-
-    # Run the image by runtime tag and copy the output /build/python to the temp dir
-    dockerId=$(docker create datadog-lambda-python-${arch}:$1)
-    docker cp $dockerId:/build/python $temp_dir/python
-
+        --progress=plain \
+        -o $temp_dir/python
 
     # Zip to destination, and keep directory structure as based in $temp_dir
     (cd $temp_dir && zip -q -r $destination ./)