only conditionalize Travis on tree changes if the build is a PR (#7460)

scripts/travis/script.sh

@@ -4,17 +4,17 @@ if [[ $TOXENV == *"remote"* ]]; then
   ./go selenium-server-standalone
 fi
 
-# Tests will be run only when each folder, such as /py, is modified
+# For PRs, tests will be run only when each folder, such as /py, is modified
 if [[ ! -z $TOXENV ]]; then
-  if git diff --name-only HEAD~1| grep '^py/' >/dev/null; then
+  if [[ $TRAVIS_PULL_REQUEST == "false" ]] || git diff --name-only HEAD~1| grep '^py/' >/dev/null; then
     tox -c py/tox.ini
   fi
 fi
 
 # Ordering matters here. We want rake tasks to run first
 if [[ ! -z $TASK ]]; then
   if [[ $TASK == //rb:* ]]; then
-     if git diff --name-only HEAD~1| grep '^rb/' >/dev/null; then
+     if [[ $TRAVIS_PULL_REQUEST == "false" ]] || git diff --name-only HEAD~1| grep '^rb/' >/dev/null; then
        ./go $TASK
      fi
   else
@@ -24,11 +24,11 @@ fi
 
 if [[ ! -z "$BUCK" ]]; then
   if [[ $BUCK == test\ //javascript/* ]]; then
-     if git diff --name-only HEAD~1| grep '^javascript/' >/dev/null; then
+     if [[ $TRAVIS_PULL_REQUEST == "false" ]] || git diff --name-only HEAD~1| grep '^javascript/' >/dev/null; then
        ./buckw $BUCK
      fi
   elif [[ $BUCK == test\ * ]]; then
-     if git diff --name-only HEAD~1| grep '^java/' >/dev/null; then
+     if [[ $TRAVIS_PULL_REQUEST == "false" ]] || git diff --name-only HEAD~1| grep '^java/' >/dev/null; then
        ./buckw $BUCK
      fi
   else
@@ -37,7 +37,7 @@ if [[ ! -z "$BUCK" ]]; then
 fi
 
 if [[ ! -z "$NPM" ]]; then
-  if git diff --name-only HEAD~1| grep '^javascript/' >/dev/null; then
+  if [[ $TRAVIS_PULL_REQUEST == "false" ]] || git diff --name-only HEAD~1| grep '^javascript/' >/dev/null; then
     ./go node:atoms
     cd javascript/node/selenium-webdriver; npm install; npm run $NPM
   fi