Update readme to have the generated image available on Mac

public-docker-images/README.md

@@ -9,13 +9,13 @@ You should run these commands from the project root.
 For the Debian-based image:
 
 ```
-docker buildx build --platform=linux/amd64,linux/arm64 --build-arg=VERSION=$(git rev-parse HEAD) --no-cache -t veneur:local -f public-docker-images/Dockerfile-debian-sid --pull --push .
+docker buildx build --platform=linux/amd64,linux/arm64 --build-arg=VERSION=$(git rev-parse HEAD) --no-cache -t veneur:local -f public-docker-images/Dockerfile-debian-sid --output tar . | docker import -
 ```
 
 For the Alpine Linux-based image:
 
 ```
-docker buildx build --platform=linux/amd64,linux/arm64 --build-arg=VERSION=$(git rev-parse HEAD) --no-cache -t veneur:local -f public-docker-images/Dockerfile-alpine --pull --push .
+docker buildx build --platform=linux/amd64,linux/arm64 --build-arg=VERSION=$(git rev-parse HEAD) --no-cache -t veneur:local -f public-docker-images/Dockerfile-alpine --output tar . | docker import -
 ```
 
 For both cases you could remove ```--platform` arugment if you just plan build for the host architechture.
@@ -49,5 +49,5 @@ $ docker run --rm -it \
 `veneur-emit` is also included in the image, and can be run explicitly like so:
 
 ```
-$ docker run --net=host -it veneur /veneur/veneur-emit -count 1 -name foo -hostport "127.0.0.1:8126"
+docker run --net=host -it veneur /veneur/veneur-emit -count 1 -name foo -hostport "127.0.0.1:8126"
 ```