fix: PSJekyll Dockerfile ( Fixes #11 )

Setting KeepGit

Author: James Brundage

Dockerfile

@@ -6,6 +6,7 @@ ENV ModuleName=PSJekyll
 ENV InstallAptGet="build-essential","ruby-full","bundler","git","curl","ca-certificates","libc6","libgcc1"
 ENV InstallModule="ugit"
 ENV InstallRubyGem="jekyll"
+ENV KeepGit="true"
 # Copy the module into the container
 RUN --mount=type=bind,src=./,target=/Initialize /bin/pwsh -nologo -command /Initialize/Container.init.ps1
 # Set the entrypoint to the script we just created.