Remove mono-project download for jammy

Author: ekilmer

docker/Dockerfile.ubuntu.vcpkg

@@ -45,11 +45,6 @@ RUN export DEBIAN_FRONTEND=noninteractive && \
 FROM base as caching
 ARG DISTRO_VERSION
 RUN export DEBIAN_FRONTEND=noninteractive && \
-    apt-get update && \
-    \
-    apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF && \
-    echo "deb https://download.mono-project.com/repo/ubuntu stable-${DISTRO_VERSION} main" | tee /etc/apt/sources.list.d/mono-official-stable.list ; \
-    \
     apt-get update && \
     apt-get install --yes mono-devel && \
     apt-get clean --yes && \