dpkg-sig does not exist in 24.04

apt-publisher/Dockerfile-ubuntu2404

@@ -6,7 +6,7 @@ ARG DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update && \
     apt install -y rng-tools gnupg2 \
-                   apache2 dpkg-dev dpkg-sig \
+                   apache2 dpkg-dev \
                    apt-utils reprepro && \
     \
     mkdir -p /repo && \