Fix Dockerfiles of CSharp/solution_2&3 and Pascal/solution_3 (PlummersSoftwareLLC#788)

Author: sonicrules1234

PrimeCSharp/solution_2/Dockerfile

@@ -13,4 +13,4 @@ RUN dotnet publish -c release -o /app --no-restore
 FROM mcr.microsoft.com/dotnet/runtime:3.1-focal
 WORKDIR /app
 COPY --from=build /app .
-ENTRYPOINT ["PrimeSieveCS"]
+ENTRYPOINT ["./PrimeSieveCS"]

PrimeCSharp/solution_3/Dockerfile

@@ -13,4 +13,4 @@ RUN dotnet publish -c release -o /app --no-restore
 FROM mcr.microsoft.com/dotnet/runtime:5.0-focal
 WORKDIR /app
 COPY --from=build /app .
-ENTRYPOINT ["PrimeSieveCS"]
+ENTRYPOINT ["./PrimeSieveCS"]

PrimePascal/solution_3/Dockerfile

@@ -7,6 +7,6 @@ RUN fpc PrimePas -O3 -v0
 
 FROM ubuntu:20.04
 WORKDIR /opt/app
-COPY --from=build /opt/app/PrimePas /opt/app/run.sh /
+COPY --from=build /opt/app/PrimePas /opt/app/run.sh /opt/app/
 
 ENTRYPOINT [ "./run.sh" ]