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ntfy notifications from unRAID using curl

Send notifications from an unRAID server to ntfy using curl. The example below notifies the result of a Docker image prune:

#!/bin/bash
OUTPUT=$(docker image prune -af | tail -1)
topicurl=https://ntfy.example.com/topic

curl --insecure \
  -d "$OUTPUT" \
  -H "Title: Dangling images cleaned on $(hostname)" \
  $topicurl