Update docker image.

build.ps1

@@ -8,7 +8,7 @@ param(
     [Parameter(Position = 2, ValueFromPipelineByPropertyName = $true)]
 	[string] $DockerImageName = "snapx",
 	[Parameter(Position = 3, ValueFromPipelineByPropertyName = $true)]
-	[string] $DockerVersion = "2.6.2",
+	[string] $DockerVersion = "2.6.10",
 	[Parameter(Position = 4, ValueFromPipelineByPropertyName = $true)]
     [switch] $DockerLocal,
     [Parameter(Position = 5, ValueFromPipelineByPropertyName = $true)]

docker/Dockerfile

@@ -7,13 +7,23 @@ ENV SNAPX_DOCKER_WORKING_DIR /build/snapx
 RUN \
   apt-get update && \
   apt-get install -y --no-install-recommends \
-    cmake make gcc-8 g++-8 mingw-w64 g++-mingw-w64-x86-64 g++-mingw-w64-i686 \
-    uuid-dev lsb-core
+    cmake make gcc-8 g++-8 uuid-dev lsb-core
 
 RUN \ 
 	update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-8 800 --slave /usr/bin/g++ g++ /usr/bin/g++-8
 
+RUN \
+  wget https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb && \
+  dpkg -i packages-microsoft-prod.deb
+
+RUN \
+  apt-get update && \
+  apt-get install -y apt-transport-https && \
+  apt-get update && \
+  apt-get install -y dotnet-sdk-2.1
+
 FROM env-build as env-run
 RUN mkdir /root/.dotnet/tools
 ENV PATH="/root/.dotnet/tools:${PATH}"
+ENV DOTNET_CLI_TELEMETRY_OPTOUT=1
 CMD ["sh", "-c", "(cd $SNAPX_DOCKER_WORKING_DIR && pwsh ./build.ps1 $BUILD_PS_PARAMETERS)"]