Merge #12851: travis: Run verify-commits only on cron jobs

fa6f12af6b travis: Run verify-commits only on cron jobs (MarcoFalke)

Pull request description:

  Since we skip travis builds on subsequent pushes (Auto Cancellation), there is no value in running verify-commits for non-cron jobs.

Tree-SHA512: a1a55c1f2877af30c1ad3ba27c7b7219317127871d49f526d2c773b21ddd022e4ad80ac4e59e690a7c91b6fed70a23a5868ee15fbf4074fd3363bc527b589c9e

.travis.yml

@@ -64,7 +64,7 @@ before_script:
     - if [ "$NEED_XVFB" = 1 ]; then export DISPLAY=:99.0; /sbin/start-stop-daemon --start --pidfile /tmp/custom_xvfb_99.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -ac; fi
 script:
     - if [ "$CHECK_DOC" = 1 -a "$TRAVIS_REPO_SLUG" = "bitcoin/bitcoin" -a "$TRAVIS_PULL_REQUEST" = "false" ]; then while read LINE; do travis_retry gpg --keyserver hkp://subset.pool.sks-keyservers.net --recv-keys $LINE; done < contrib/verify-commits/trusted-keys; fi
-    - if [ "$CHECK_DOC" = 1 -a "$TRAVIS_REPO_SLUG" = "bitcoin/bitcoin" -a "$TRAVIS_PULL_REQUEST" = "false" ]; then contrib/verify-commits/verify-commits.sh; fi
+    - if [ "$CHECK_DOC" = 1 -a "$TRAVIS_REPO_SLUG" = "bitcoin/bitcoin" -a "$TRAVIS_EVENT_TYPE" = "cron" ]; then travis_wait 30 contrib/verify-commits/verify-commits.sh; fi
     - export TRAVIS_COMMIT_LOG=`git log --format=fuller -1`
     - if [ -n "$USE_SHELL" ]; then export CONFIG_SHELL="$USE_SHELL"; fi
     - OUTDIR=$BASE_OUTDIR/$TRAVIS_PULL_REQUEST/$TRAVIS_JOB_NUMBER-$HOST