Delete ECR images keeping only the last N more recent

deleteECRImages.sh

REPO=$1
KEEP_IMAGES=$2 # number of images you want to remain
aws ecr describe-images --repository-name $REPO --query 'imageDetails[]' \
    | jq --raw-output 'sort_by(.imagePushedAt) | reverse | .[].imageDigest' \
    | awk "NR > ${KEEP_IMAGES}" \
    | xargs -I{} aws ecr batch-delete-image --repository-name $REPO --image-ids imageDigest={}