Add --platform flag to docker create commands

Author: ghostwriternr

.github/workflows/pkg-pr-new.yml

@@ -112,7 +112,7 @@ jobs:
       - name: Extract standalone binary from Docker image
         run: |
           VERSION=${{ steps.package-version.outputs.version }}
-          CONTAINER_ID=$(docker create cloudflare/sandbox:$VERSION)
+          CONTAINER_ID=$(docker create --platform linux/amd64 cloudflare/sandbox:$VERSION)
           docker cp $CONTAINER_ID:/container-server/sandbox ./sandbox-linux-x64
           docker rm $CONTAINER_ID
           chmod +x ./sandbox-linux-x64

.github/workflows/release.yml

@@ -216,7 +216,7 @@ jobs:
       - name: Extract standalone binary from Docker image
         run: |
           VERSION=${{ needs.unit-tests.outputs.version }}
-          CONTAINER_ID=$(docker create cloudflare/sandbox:$VERSION)
+          CONTAINER_ID=$(docker create --platform linux/amd64 cloudflare/sandbox:$VERSION)
           docker cp $CONTAINER_ID:/container-server/sandbox ./sandbox-linux-x64
           docker rm $CONTAINER_ID
           file ./sandbox-linux-x64