fix: invalid tarball manifest creation (#326)

oci/private/tarball.sh.tpl

@@ -8,12 +8,6 @@ readonly BLOBS_DIR="${STAGING_DIR}/blobs"
 readonly TARBALL_PATH="{{tarball_path}}"
 readonly TAGS_FILE="{{tags}}"
 
-# Replace newlines (unix or windows line endings) with % character.
-# We can't pass newlines to yq due to https://github.com/mikefarah/yq/issues/1430 and 
-# we can't update YQ at the moment because structure_test depends on a specific version:
-# see https://github.com/bazel-contrib/rules_oci/issues/212 
-REPOTAGS="$(tr -d '\r' < "${TAGS_FILE}" | tr '\n' '%')"
-
 MANIFEST_DIGEST=$(${YQ} eval '.manifests[0].digest | sub(":"; "/")' "${IMAGE_DIR}/index.json" | tr  -d '"')
 MANIFEST_BLOB_PATH="${IMAGE_DIR}/blobs/${MANIFEST_DIGEST}"
 
@@ -29,7 +23,11 @@ for LAYER in $(${YQ} ".[]" <<< $LAYERS); do
     cp -f "${IMAGE_DIR}/blobs/${LAYER}" "${BLOBS_DIR}/${LAYER}.tar.gz"
 done
 
-repo_tags="${REPOTAGS}" \
+# Replace newlines (unix or windows line endings) with % character.
+# We can't pass newlines to yq due to https://github.com/mikefarah/yq/issues/1430 and
+# we can't update YQ at the moment because structure_test depends on a specific version:
+# see https://github.com/bazel-contrib/rules_oci/issues/212
+repo_tags="$(tr -d '\r' < "${TAGS_FILE}" | tr '\n' '%')" \
 config="blobs/${CONFIG_DIGEST}" \
 layers="${LAYERS}" \
 "${YQ}" eval \