feat: support darwin-arm64 CLI binary (aws#2802)

<!-- Provide summary of changes -->

- Compile and publish darwin/arm64 copilot CLI binary. 
  - This will allow copilot to run natively on newer macs rather than being emulated. 

I've tested the binary compilation but not sure if I can test the actual release build specs easily. 

Resolves aws#2745 

<!-- Issue number, if available. E.g. "Fixes aws#31", "Addresses aws#42, 77" -->

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.release/buildspec.yml

@@ -34,15 +34,19 @@ phases:
       - ARTIFACT_DIRECTORY=aws/copilot
       - mkdir -p $ARTIFACT_DIRECTORY
       - mv ./bin/local/copilot.exe $ARTIFACT_DIRECTORY/copilot-windows-$VERSION.exe
-      - mv ./bin/local/copilot $ARTIFACT_DIRECTORY/copilot-darwin-$VERSION
+      - cp ./bin/local/copilot-darwin-amd64 $ARTIFACT_DIRECTORY/copilot-darwin-$VERSION
+      - mv ./bin/local/copilot-darwin-amd64 $ARTIFACT_DIRECTORY/copilot-darwin-amd64-$VERSION
+      - mv ./bin/local/copilot-darwin-arm64 $ARTIFACT_DIRECTORY/copilot-darwin-arm64-$VERSION
       - cp ./bin/local/copilot-linux-amd64 $ARTIFACT_DIRECTORY/copilot-linux-$VERSION
       - mv ./bin/local/copilot-linux-amd64 $ARTIFACT_DIRECTORY/copilot-linux-amd64-$VERSION
       - mv ./bin/local/copilot-linux-arm64 $ARTIFACT_DIRECTORY/copilot-linux-arm64-$VERSION
       - |
         if [ ! -z "$GIT_TAG" ];then
             echo "Generating latest binaries as well for $GIT_TAG"
             cp $ARTIFACT_DIRECTORY/copilot-windows-$VERSION.exe $ARTIFACT_DIRECTORY/copilot-windows.exe
-            cp $ARTIFACT_DIRECTORY/copilot-darwin-$VERSION $ARTIFACT_DIRECTORY/copilot-darwin
+            cp $ARTIFACT_DIRECTORY/copilot-darwin-amd64-$VERSION $ARTIFACT_DIRECTORY/copilot-darwin
+            cp $ARTIFACT_DIRECTORY/copilot-darwin-amd64-$VERSION $ARTIFACT_DIRECTORY/copilot-darwin-amd64
+            cp $ARTIFACT_DIRECTORY/copilot-darwin-arm64-$VERSION $ARTIFACT_DIRECTORY/copilot-darwin-arm64
             cp $ARTIFACT_DIRECTORY/copilot-linux-$VERSION $ARTIFACT_DIRECTORY/copilot-linux
             cp $ARTIFACT_DIRECTORY/copilot-linux-arm64-$VERSION $ARTIFACT_DIRECTORY/copilot-linux-arm64
         fi
@@ -51,6 +55,8 @@ phases:
       - MANIFESTFILE="$COMMIT_ID.manifest"
       - echo $ARTIFACT_DIRECTORY/copilot-windows-$VERSION.exe >> $MANIFESTFILE
       - echo $ARTIFACT_DIRECTORY/copilot-darwin-$VERSION >> $MANIFESTFILE
+      - echo $ARTIFACT_DIRECTORY/copilot-darwin-amd64-$VERSION >> $MANIFESTFILE
+      - echo $ARTIFACT_DIRECTORY/copilot-darwin-arm64-$VERSION >> $MANIFESTFILE
       - echo $ARTIFACT_DIRECTORY/copilot-linux-$VERSION >> $MANIFESTFILE
       - echo $ARTIFACT_DIRECTORY/copilot-linux-amd64-$VERSION >> $MANIFESTFILE
       - echo $ARTIFACT_DIRECTORY/copilot-linux-arm64-$VERSION >> $MANIFESTFILE
@@ -59,6 +65,8 @@ phases:
             echo "Copying the latest binaries to the manifest for $GIT_TAG"
             echo $ARTIFACT_DIRECTORY/copilot-windows.exe >> $MANIFESTFILE
             echo $ARTIFACT_DIRECTORY/copilot-darwin >> $MANIFESTFILE
+            echo $ARTIFACT_DIRECTORY/copilot-darwin-amd64 >> $MANIFESTFILE
+            echo $ARTIFACT_DIRECTORY/copilot-darwin-arm64 >> $MANIFESTFILE
             echo $ARTIFACT_DIRECTORY/copilot-linux >> $MANIFESTFILE
             echo $ARTIFACT_DIRECTORY/copilot-linux-arm64 >> $MANIFESTFILE
         fi

Makefile

@@ -54,7 +54,8 @@ compile-linux:
 
 .PHONY: compile-darwin
 compile-darwin:
-	CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -ldflags "${LINKER_FLAGS} ${RELEASE_BUILD_LINKER_FLAGS}" -o ${DESTINATION} ./cmd/copilot
+	CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -ldflags "${LINKER_FLAGS} ${RELEASE_BUILD_LINKER_FLAGS}" -o ${DESTINATION}-darwin-amd64 ./cmd/copilot
+	CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build -ldflags "${LINKER_FLAGS} ${RELEASE_BUILD_LINKER_FLAGS}" -o ${DESTINATION}-darwin-arm64 ./cmd/copilot
 
 .PHONY: test
 test: run-unit-test custom-resource-tests