gitlab-ci: configure rules to enable continuous builds of staged MRs

Configure rules to allow jobs for continuous builds to be enabled on a
project that configures a specific branch this purpose.

.gitlab/ci/gitlab_ci.cmake

@@ -49,6 +49,12 @@ endif ()
 set(ctest_track "Experimental")
 if (NOT "$ENV{CI_MERGE_REQUEST_ID}" STREQUAL "")
   set(ctest_track "merge-requests")
+elseif (NOT "$ENV{CMAKE_CI_PROJECT_CONTINUOUS_BRANCH}" STREQUAL "" AND "$ENV{CMAKE_CI_PROJECT_CONTINUOUS_BRANCH}" STREQUAL "$ENV{CI_COMMIT_BRANCH}" AND NOT "$ENV{CMAKE_CI_JOB_CONTINUOUS}" STREQUAL "")
+  if (NOT "$ENV{CMAKE_CI_JOB_HELP}" STREQUAL "")
+    set(ctest_track "Continuous Help")
+  else()
+    set(ctest_track "Continuous")
+  endif()
 elseif ("$ENV{CI_PROJECT_PATH}" STREQUAL "cmake/cmake")
   if ("$ENV{CI_COMMIT_REF_NAME}" STREQUAL "master")
     set(ctest_track "master")

.gitlab/rules.yml

@@ -4,6 +4,9 @@
     rules:
         - if: '$CMAKE_CI_PACKAGE == "true"'
           when: never
+        - if: '($CMAKE_CI_PROJECT_CONTINUOUS_BRANCH != "" && $CI_COMMIT_BRANCH == $CMAKE_CI_PROJECT_CONTINUOUS_BRANCH && $CMAKE_CI_JOB_CONTINUOUS == "true")'
+          when: delayed
+          start_in: 5 minutes
         - if: '$CI_MERGE_REQUEST_ID'
           when: manual
         - if: '$CI_PROJECT_PATH == "cmake/cmake"'
@@ -15,6 +18,8 @@
     rules:
         - if: '$CMAKE_CI_PACKAGE == "true"'
           when: never
+        - if: '($CMAKE_CI_PROJECT_CONTINUOUS_BRANCH != "" && $CI_COMMIT_BRANCH == $CMAKE_CI_PROJECT_CONTINUOUS_BRANCH && $CMAKE_CI_JOB_CONTINUOUS == "true")'
+          when: on_success
         - if: '$CI_MERGE_REQUEST_ID'
           when: on_success
         - if: '$CI_PROJECT_PATH == "cmake/cmake"'