chore(github-action): modify addblob caching

With dev release, blobs are not published, so we need to add dev blobs on each run.
A non publish blobs is identified by is lack of object_id

addblob.sh

@@ -9,8 +9,9 @@ function addBlobOnChecksumChange() {
   src="$1"
   target="$2"
   blob_checksum=$(cat config/blobs.yml  | yq .'"'${target}'"'.sha)
+  blob_object_id=$(cat config/blobs.yml  | yq .'"'${target}'"'.object_id) # With dev release, blobs are not publish yet, so we need to add it again
   src_checksum=$(cat "${src}"  | sha256sum |  cut -d " " -f1)
-  if [ "${blob_checksum}" != "sha256:${src_checksum}" ]; then
+  if [ "${blob_checksum}" != "sha256:${src_checksum}" ] || [ "$blob_object_id" = "null" ]; then
     bosh add-blob ${src} ${target}
   else
     echo "skipping blob creation for ${target} with existing checksum: ${src_checksum}"