CI docker image platform bugfix (#235)

* Initial fix test

* Add fix to hardhat build

Author: cbrit

.github/workflows/integration-tests.yml

@@ -54,6 +54,7 @@ jobs:
           context: .
           file: Dockerfile
           push: true
+          platforms: linux/amd64, linux/arm64/v8
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           builder: ${{ steps.buildx.outputs.name }}
@@ -100,6 +101,7 @@ jobs:
           context: integration_tests/ethereum
           file: integration_tests/ethereum/Dockerfile
           push: true
+          platforms: linux/amd64, linux/arm64/v8
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           builder: ${{ steps.buildx.outputs.name }}