acr delete old images

# azure-pipelines.yml
variables:
  currentSemver: '1.2.3'  # Replace with your current semver
  ACR_NAME: 'myregistry'   # Replace with your ACR name
  REPO_NAME: 'myrepository' # Replace with your repository name

steps:
- task: AzureCLI@2
  inputs:
    azureSubscription: 'MyAzureSubscription'  # Replace with your Azure subscription
    scriptType: 'bash'
    scriptLocation: 'inlineScript'
    inlineScript: |
      set -e

      # Authenticate with ACR
      az acr login --name $(ACR_NAME)

      # Define variables
      CURRENT_SEMVER=$(currentSemver)
      echo "Current semver: $CURRENT_SEMVER"

      # Retrieve all tags from the repository
      TAGS=$(az acr repository show-tags --name $(ACR_NAME) --repository $(REPO_NAME) --output tsv)
      echo "Tags: $TAGS"

      # Loop through each tag
      for TAG in $TAGS
      do
        echo "Processing tag: $TAG"

        # Check if the tag is a valid semver
        if [[ $TAG =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]
        then
          echo "Tag $TAG is a valid semver"

          # Compare the tag with the current semver
          if [ "$(printf '%s\n' "$CURRENT_SEMVER" "$TAG" | sort -V | head -n1)" = "$TAG" ] && [ "$TAG" != "$CURRENT_SEMVER" ]; then
            echo "Tag $TAG is older than current semver $CURRENT_SEMVER. Deleting..."

            # Delete the image with the older tag
            az acr repository delete --name $(ACR_NAME) --image $(REPO_NAME):$TAG --yes
          else
            echo "Tag $TAG is equal to or newer than current semver $CURRENT_SEMVER. Keeping it."
          fi
        else
          echo "Tag $TAG is not a valid semver. Skipping..."
        fi
      done