Fix Packaging/dockerfiles/linux-x64.dockerfile and update to use Ubuntu 22.04 (#437)

It didn't work for me out of the box because the compiled VirtualClient binary
wasn't in a publish subdirectory.

Some profiles's package installation actions require lsb-release, sudo, wget,
and gnupg, so add them to the Dockerfile.

Update to Ubuntu 22.04 since that's what VirtualClient supports.

Signed-off-by: Bryan DeYoung <35380894+brdeyo@users.noreply.github.com>
Co-authored-by: Bryan DeYoung <35380894+brdeyo@users.noreply.github.com>

Author: micromaomao

src/VirtualClient/VirtualClient.Packaging/dockerfiles/linux-x64.dockerfile

@@ -1,5 +1,7 @@
 ARG REPO=mcr.microsoft.com/dotnet/runtime
-# Ubuntu 20.04 image.
-FROM ${REPO}:5.0.9-focal-amd64
+# Ubuntu 22.04 image.
+FROM ${REPO}:8.0-jammy-amd64
+# VirtualClient dependencies.
+RUN apt-get update -y && apt-get install -y lsb-release sudo wget gnupg
 
-COPY out/bin/Release/x64/VirtualClient.Main/net9.0/linux-x64/publish/. ./VirtualClient/
+COPY out/bin/Release/x64/VirtualClient.Main/net8.0/linux-x64/. ./VirtualClient/