Update Dockerfile

Author: johndowns

Dockerfile

@@ -3,7 +3,7 @@ FROM mcr.microsoft.com/windows/servercore:ltsc2019
 # Download the latest self-hosted integration runtime installer into the SHIR folder
 COPY SHIR C:/SHIR/
 
-ADD https://go.microsoft.com/fwlink/?linkid=839822&clcid=0x409 C:/SHIR/
+RUN curl -L 'https://go.microsoft.com/fwlink/?linkid=839822&clcid=0x409' --output C:/SHIR/SHIR.msi
 
 RUN ["powershell", "C:/SHIR/build.ps1"]