Upgrade to MetalLB v0.13.3

No problems whatsoever by automatically applying the MetalLB Helm chart on both architectures - arm64 and amd64 - with the Flux V2 GitOps approach.
metallb-chart-0.13.2
Version 0.13.2
metallb-chart-0.13.3
Version 0.13.3
Importing Docker container images for arm64 and amd64 architecture into private Sonatype Nexus registry by means of Docker fat-manifest.

docker image pull --platform linux/amd64 quay.io/metallb/controller:v0.13.3
docker inspect quay.io/metallb/controller:v0.13.3
docker tag quay.io/metallb/controller:v0.13.3 registry.bierochs.org/metallb/controller:v0.13.3-amd64
docker push registry.bierochs.org/metallb/controller:v0.13.3-amd64
docker image pull --platform linux/arm64 quay.io/metallb/controller:v0.13.3
docker inspect quay.io/metallb/controller:v0.13.3
docker tag quay.io/metallb/controller:v0.13.3 registry.bierochs.org/metallb/controller:v0.13.3-arm64
docker push registry.bierochs.org/metallb/controller:v0.13.3-arm64
docker manifest create registry.bierochs.org/metallb/controller:v0.13.3 --amend registry.bierochs.org/metallb/controller:v0.13.3-amd64 --amend registry.bierochs.org/metallb/controller:v0.13.3-arm64
docker manifest push registry.bierochs.org/metallb/controller:v0.13.3

To automate this procedure the following shell script is implemented:

#!/bin/bash

while [ "$#" -gt 0 ]; do
  case "$1" in
    -r) SRC_DCKR_RGT="$2"; shift 2;;
    -i) SRC_DCKR_IMG="$2"; shift 2;;
    -t) SRC_DCKR_TG="$2"; shift 2;;

    --registry=*) SRC_DCKR_RGT="${1#*=}"; shift 1;;
    --image=*) SRC_DCKR_IMG="${1#*=}"; shift 1;;
    --tag=*) SRC_DCKR_TG="${1#*=}"; shift 1;;
    --registry|--image|--tag) echo "$1 requires an argument" >&2; exit 1;;

    -*) echo "unknown option: $1" >&2; exit 1;;
    *) handle_argument "$1"; shift 1;;
  esac
done

echo "registry: $SRC_DCKR_RGT"
echo "image: $SRC_DCKR_IMG"
echo "tag: $SRC_DCKR_TG"

export ARCH_DCKR=('amd64' 'arm64')
for ARCH in "${ARCH_DCKR[@]}"
do
  docker pull --platform linux/"$ARCH" $SRC_DCKR_RGT/$SRC_DCKR_IMG:$SRC_DCKR_TG
  docker tag $SRC_DCKR_RGT/$SRC_DCKR_IMG:$SRC_DCKR_TG registry.bierochs.org/$SRC_DCKR_IMG:$SRC_DCKR_TG-"$ARCH"
  docker push registry.bierochs.org/$SRC_DCKR_IMG:$SRC_DCKR_TG-"$ARCH"
done

docker manifest create registry.bierochs.org/$SRC_DCKR_IMG:$SRC_DCKR_TG \
  --amend registry.bierochs.org/$SRC_DCKR_IMG:$SRC_DCKR_TG-amd64 \
  --amend registry.bierochs.org/$SRC_DCKR_IMG:$SRC_DCKR_TG-arm64

docker manifest push registry.bierochs.org/$SRC_DCKR_IMG:$SRC_DCKR_TG

Which should be used like this:

multi_arch_docker_to_nexus.sh \
  -r quay.io \
  -i metallb/speaker \
  -t v0.13.3