Update Dockerfile

Author: MarkMoelter

worker/Dockerfile

@@ -1,4 +1,4 @@
-FROM microsoft/dotnet:2.0.0-sdk
+FROM mcr.microsoft.com/dotnet/sdk:8.0
 
 WORKDIR /code
 
@@ -7,4 +7,4 @@ ADD src/Worker /code/src/Worker
 RUN dotnet restore -v minimal src/Worker \
     && dotnet publish -c Release -o "./" "src/Worker/" 
 
-CMD dotnet src/Worker/Worker.dll
+CMD dotnet src/Worker/Worker.dll