Connect to a shell session in the BuildKit CLI Pod (if you're not already connected):
kubectl exec -it buildkit-cli -- sh
Set an environment variable for the build version:
export BUILD_VERSION=0.1.0
Add the tag to the name field in the output parameter, separating it from the image name with a colon:
cd ~
buildctl --addr tcp://buildkitd:1234 build --frontend=dockerfile.v0 --local context=. --local dockerfile=. --output type=image,name=${REGISTRY}/${REPOSITORY}/simple:${BUILD_VERSION},push=true
Now you can update the version number and repeat the same command:
export BUILD_VERSION=0.2.0
buildctl --addr tcp://buildkitd:1234 build --frontend=dockerfile.v0 --local context=. --local dockerfile=. --output type=image,name=${REGISTRY}/${REPOSITORY}/simple:${BUILD_VERSION},push=true
Check your tags on Docker Hub (or your own registry) to verify the new images have been pushed.