No need to get the manifest list, just use tag

docker.sh

@@ -1,29 +1,12 @@
 #!/usr/bin/env bash
 
-get_digest() {
-    local repo=$1
-    local tag=$2
-
-    manifestOutput=$(curl -H "Authorization: Bearer $(get_token $repo)" -H "Accept: application/vnd.docker.distribution.manifest.list.v2+json" "https://index.docker.io/v2/${repo}/manifests/${tag}" 2>/dev/null)
-
-    manifest_lists=$(jq -r '.manifests' <<<"$manifestOutput")
-
-    for manifest in $(jq -r '.[] | @text' <<<"$manifest_lists"); do
-        platform=$(jq -r '.platform.architecture' <<<"$manifest")
-        if [ $platform == "amd64" ]; then
-            echo $(jq -r '.digest' <<<"$manifest")
-            break
-        fi
-    done
-}
-
 get_layers() {
     local repo=$1
     local digest=$2
 
     digestOutput=$(curl -H "Authorization: Bearer $(get_token $repo)" -H "Accept: application/vnd.docker.distribution.manifest.v2+json" "https://index.docker.io/v2/${repo}/manifests/${digest}" 2>/dev/null)
 
-    jq -r '[.layers[].digest]' <<<$digestOutput
+    jq -r '[.layers[].digest]' <<<"$digestOutput"
 }
 
 get_token() {
@@ -34,10 +17,7 @@ get_token() {
 IFS=: read base base_tag <<<$base
 IFS=: read image image_tag <<<$image
 
-digest_base=$(get_digest $base ${base_tag:-latest})
-layers_base=$(get_layers $base $digest_base)
-
-digest_image=$(get_digest $image ${image_tag:-latest})
-layers_image=$(get_layers $image $digest_image)
+layers_base=$(get_layers $base ${base_tag:-latest})
+layers_image=$(get_layers $image ${image_tag:-latest})
 
 jq '.base-.image | .!=[]' <<<"{\"base\": $layers_base, \"image\": $layers_image }"