only run cron dependency check on 5.6 (GoogleCloudPlatform#548)

Author: bshaffer

.travis.yml

@@ -28,7 +28,7 @@ php:
 matrix:
   include:
     - php: 5.6
-      env: RUN_DEVSERVER_TESTS=true RUN_CS_FIXER=true
+      env: RUN_DEVSERVER_TESTS=true RUN_CS_FIXER=true RUN_DEPENDENCY_CHECK=true
     - php: 7.2
       env: SKIP_GRPC=true
 

testing/run_all_tests.sh

@@ -45,6 +45,8 @@ if [ "${RUN_CS_FIXER}" = "true" ]; then
 fi
 $DIR/run_test_suite.sh;
 # only run for travis crons
-if [ "${TRAVIS_EVENT_TYPE}" != "pull_request" ]; then
+if [ "${TRAVIS_EVENT_TYPE}" != "pull_request" ] && \
+   [ "${RUN_DEPENDENCY_CHECK}" = "true" ]
+then
   $DIR/run_dependency_check.sh;
 fi