Ensure PR builds checkout the correct commit

Author: mark-vieira

.ci/jobs.t/elastic+elasticsearch+pull-request+docs-check.yml

@@ -6,8 +6,9 @@
     workspace: "/dev/shm/elastic+elasticsearch+%BRANCH%+pull-request+docs-check"
     scm:
       - git:
-          refspec: "+refs/pull/${{ghprbPullId}}/*:refs/remotes/origin/pr/${{ghprbPullId}}/*"
-          branch: "${ghprbActualCommit}"
+          refspec: "+refs/pull/${ghprbPullId}/*:refs/remotes/origin/pr/${ghprbPullId}/*"
+          branches: 
+            - "${ghprbActualCommit}"
     triggers:
       - github-pull-request:
           org-list:

.ci/jobs.t/elastic+elasticsearch+pull-request+precommit.yml

@@ -6,8 +6,9 @@
     workspace: "/dev/shm/elastic+elasticsearch+%BRANCH%+pull-request+precommit"
     scm:
       - git:
-          refspec: "+refs/pull/${{ghprbPullId}}/*:refs/remotes/origin/pr/${{ghprbPullId}}/*"
-          branch: "${ghprbActualCommit}"
+          refspec: "+refs/pull/${ghprbPullId}/*:refs/remotes/origin/pr/${ghprbPullId}/*"
+          branches: 
+            - "${ghprbActualCommit}"
     triggers:
       - github-pull-request:
           org-list:

.ci/templates.t/pull-request-gradle-unix.yml

@@ -6,8 +6,9 @@
     workspace: "/dev/shm/elastic+elasticsearch+%BRANCH%+pull-request+{pr-job}"
     scm:
       - git:
-          refspec: "+refs/pull/${{ghprbPullId}}/*:refs/remotes/origin/pr/${{ghprbPullId}}/*"
-          branch: "${ghprbActualCommit}"
+          refspec: "+refs/pull/${ghprbPullId}/*:refs/remotes/origin/pr/${ghprbPullId}/*"
+          branches: 
+            - "${ghprbActualCommit}"
     triggers:
       - github-pull-request:
           org-list: