fix: jq: error (at <stdin>:16): Cannot use null (null) as object key error on empty line in labels file (#606)

Author: bozaro

oci/private/image.sh

@@ -159,7 +159,7 @@ for ARG in "$@"; do
     CONFIG=$(jq --arg workdir "${ARG#--workdir=}" '.config.WorkingDir = $workdir' <<<"$CONFIG")
     ;;
   --labels=*)
-    CONFIG=$(jq --rawfile labels "${ARG#--labels=}" '.config.Labels += ($labels | split("\n") | map(. | split("=")) | map({key: .[0], value: .[1:] | join("=")}) | from_entries)' <<<"$CONFIG")
+    CONFIG=$(jq --rawfile labels "${ARG#--labels=}" '.config.Labels += ($labels | split("\n") | map(select(. | length > 0)) | map(. | split("=")) | map({key: .[0], value: .[1:] | join("=")}) | from_entries)' <<<"$CONFIG")
     ;;
   --annotations=*)
     get_manifest |