added ci bootstrapping script for windows, as we cannot remove a bat

file that is being executed. workaround is to copy the file and call it
on the new location

CI/ci-windows-bootstrap.bat

+@echo off
+
+REM bootstrapping script for stage 2 ci scripts
+REM to avoid repetitive cloning, in lieu of the sgitlab tickyrunners
+REM we copy the entire content of our bild folder to an artifacts subdolder 
+REM and share it with other buildstages.
+REM
+REM initial building is considered as stage 0,this script is stage 1 all 
+REM following stages are stage 2. The purpos of this script is to move all 
+REM files from the artifacts directory back to the root directory and call 
+REM the script for this ci job.
+REM This way the stage 2 script can delete the artifacts folder safely, as
+REM deleting a script that is running will cause an error on windows systems.
+REM 
+
+REM #######################################
+REM # bootstrap level 0 
+REM #######################################
+
+
+
+
+IF "%BOOTSTRAPLEVEL%" == "" ( 
+set BOOTSTRAPLEVEL=0
+)
+
+IF "%BOOTSTRAPLEVEL%" == "0" (
+
+REM copy all files from artifacts folder to root folder
+echo %TIME%: Restoring artifacts from artifacts directory ...
+robocopy artifacts ./ /e /NFL /NDL /NJH /NJS /nc /ns /np
+
+REM set the bootstrap level to 1
+echo %TIME%: Entering bootstrap level 1 ...
+set BOOTSTRAPLEVEL=1
+
+REM call the copy of this script outside artifacts folder
+call %~dp0\..\..\CI\ci-windows-bootstrap.bat
+
+REM return the error code if not 0
+IF "%errorlevel%" NEQ "0" exit /b %errorlevel%
+) else (
+
+REM #######################################
+REM # bootstrap level 1
+REM #######################################
+REM remove the artifacts folder, it may cause problems with e.g. cmake
+echo %Time%: Removing artifacts directory ...
+rmdir /Q /S artifacts
+
+REM call the stage 2 script
+echo %Time%: Calling %~dp0\%STAGE2SCRIPT% ...
+call %~dp0\%STAGE2SCRIPT%
+
+REM store the error code of the stage 2 script
+set bootstrapretval=%errorlevel%
+
+REM copy this script back to the artifacts folder 
+if not exist ./artifacts (
+echo %Time%: recrerating artifacts directory ...
+cd %~dp0\..
+mkdir artifacts
+cd artifacts
+mkdir CI
+cd ..
+)
+echo %Time%: restoring bootstrap script ...
+cp %~dp0\ci-windows-bootstrap.bat artifacts/CI/ci-windows-bootstrap.bat
+
+REM when this script returns, the windows Command interpreter will look
+REM at the original position for the script to continue after the the call command
+REM of level 0
+IF "%bootstrapretval%" NEQ "0" exit /b %bootstrapretval%
+)
\ No newline at end of file