private static Blob decompress(Blob blob) throws IOException {
    return Blobs.from(new GZIPInputStream(new ByteArrayInputStream(Blobs.writeToByteArray(blob))));
  }
Gets a {@link Blob} that is {@code blob} decompressed.

@param blob the {@link Blob} to decompress
@return the decompressed {@link Blob}
@throws IOException if an I/O exception occurs
jib-core/src/test/java/com/google/cloud/tools/jib/cache/CacheTest.java