Automatically purge images from an Azure Container Registry

acr_tasks.sh

#!/bin/bash
REGISTRY={{name}}
REPOSITORIES=$(az acr repository list --name $REGISTRY --output tsv | grep '^prefix')

for REPOSITORY in ${REPOSITORIES[*]}
do
    echo =======================================================================
    echo Creating task for repository: $REPOSITORY
    echo =======================================================================
    PURGE_CMD="acr purge --filter '$REPOSITORY:.*' --ago 7d --untagged --keep 7"

    NAME=$(echo "$REPOSITORY" | awk -F'-' '{print $NF}')
    az acr task create --name purge-$NAME \
        --cmd "$PURGE_CMD" \
        --schedule "0 0 * * *" \
        --registry $REGISTRY \
        --output table \
        --context /dev/null
done