move docker file changes from buildfeb2020 branch

Author: JamesWTruher

tools/releaseBuild/Image/DockerFile

@@ -1,7 +1,7 @@
 # escape=`
 #0.3.6 (no powershell 6)
 # FROM microsoft/windowsservercore
-FROM microsoft/dotnet-framework:4.7.1
+FROM mcr.microsoft.com/dotnet/framework/sdk:4.8
 LABEL maintainer='PowerShell Team <powershellteam@hotmail.com>'
 LABEL description="This Dockerfile for Windows Server Core with git installed via chocolatey."
 
@@ -14,19 +14,20 @@ COPY dockerInstall.psm1 containerFiles/dockerInstall.psm1
 RUN Import-Module PackageManagement; `
     Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force; `
     Import-Module ./containerFiles/dockerInstall.psm1; `
+    [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor [System.Net.SecurityProtocolType]::Tls12; `
     Install-ChocolateyPackage -PackageName git -Executable git.exe; `
     Install-ChocolateyPackage -PackageName nuget.commandline -Executable nuget.exe -Cleanup; `
     Install-Module -Force -Name platyPS -Repository PSGallery; `
     Invoke-WebRequest -Uri https://raw.githubusercontent.com/dotnet/cli/master/scripts/obtain/dotnet-install.ps1 -outfile C:/dotnet-install.ps1; `
     C:/dotnet-install.ps1 -Channel Release -Version 2.1.4; `
     Add-Path C:/Users/ContainerAdministrator/AppData/Local/Microsoft/dotnet;
 
-RUN Import-Module ./containerFiles/dockerInstall.psm1; `
+#RUN Import-Module ./containerFiles/dockerInstall.psm1; `
 #   git clone https://Github.com/PowerShell/PSScriptAnalyzer; `
-    Install-ChocolateyPackage -PackageName dotnet4.5;
+#    Install-ChocolateyPackage -PackageName dotnet4.5;
 
-RUN Import-Module ./containerFiles/dockerInstall.psm1; `
-    Install-ChocolateyPackage -PackageName netfx-4.5.2-devpack;
+#RUN Import-Module ./containerFiles/dockerInstall.psm1; `
+#    Install-ChocolateyPackage -PackageName netfx-4.5.2-devpack;
 
 COPY buildPSSA.ps1 containerFiles/buildPSSA.ps1