Update Tekton bundle references in Tekton resource files.

update-tekton-digests.sh

#!/bin/bash
set -euo pipefail

FILES=$@

# Find existing image references
OLD_REFS="$(\
    yq '.' $FILES  --output-format json | \
    jq '.. | .taskRef? | select(. != null) | .params[] | select(.name == "bundle") | .value' -r |
    sort -u \
)"

# Find updates for image references
for old_ref in ${OLD_REFS}; do
    repo_tag="${old_ref%@*}"
    new_digest="$(skopeo inspect --no-tags docker://${repo_tag} | yq '.Digest')"
    new_ref="${repo_tag}@${new_digest}"
    [[ $new_ref == $old_ref ]] && continue
    echo "New digest found! $new_ref"
    for file in $FILES; do
        sed -i "s!${old_ref}!${new_ref}!g" $file
    done
done