Add helper script for image digests

Signed-off-by: Alexandr Demicev <alexandr.demicev@suse.com>

scripts/image-digest.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# Run your command and capture its output
+output=$(make docker-list-all REGISTRY="$1" ORG="$2" TAG="$3")
+
+# Use a for loop to iterate over each line
+IFS=$'\n'       # Set the Internal Field Separator to newline
+line_count=0    # Counter to keep track of the current line
+total_lines=$(echo "$output" | wc -l)  # Get the total number of lines
+githubimageoutput=("multiarch_image" "amd64_image" "arm64_image" "s390x_image")
+githubdigestoutput=("multiarch_digest" "amd64_digest" "arm64_digest" "s390x_digest")
+
+for line in $output; do
+  # Run the Docker command and get the digest
+  digest=$(docker buildx imagetools inspect "$line" --format '{{json .}}' | jq -r .manifest.digest)
+
+  # Add image name and digest to the output
+  echo "${githubimageoutput[$line_count]}=$line" >> "$GITHUB_OUTPUT"
+  echo "${githubdigestoutput[$line_count]}=$digest" >> "$GITHUB_OUTPUT"
+
+  # Increment the line counter
+  line_count=$((line_count + 1))
+done