fix PR tests

Author: me-no-dev

tools/build.sh

@@ -9,4 +9,6 @@ tools/build-tests.sh
 if [ $? -ne 0 ]; then exit 1; fi
 
 # zip the package if tagged build, otherwise finish here
-tools/build-release.sh -a$ESP32_GITHUB_TOKEN
+if [ ! -z "$TRAVIS_TAG" ]; then
+    tools/build-release.sh -a$ESP32_GITHUB_TOKEN
+fi