gitlab-ci: run jobs only on demand

19 jobs for !745 with gitlab-ci-windows
merge request
Name Stage Failure
build:windows-vs2019-mpi Build
build/tests/: found 4 matching files               
build/CTestCustom*.cmake: found 1 matching files

build/CTestTestfile.cmake: found 1 matching files

build/superbuild/CTestTestfile.cmake: found 1 matching files

build/Testing/: found 13 matching files

build/DartConfiguration.tcl: found 1 matching files

WARNING: Failed to load system CertPool: crypto/x509: system root pool is not available on Windows
Uploading artifacts as "archive" to coordinator... ok
id=5154761 responseStatus=201 Created token=QHeo8oUF
ERROR: Job failed: exit status 1