Use a different env name for tests

.travis.yml

@@ -5,8 +5,12 @@ matrix:
     language: minimal
     services:
     - docker
+    env:
+    - OS_NAME: linux
   - os: osx
     language: minimal
+    env:
+    - OS_NAME: macos
     osx_image: xcode10.2
 script:
 - ./build.sh _travis-${TRAVIS_OS_NAME}

scripts/travis_test.sh

@@ -2,5 +2,5 @@
 
 set -ex
 
-./dist/${TRAVIS_OS_NAME}/amd64/ooni onboard --yes
-./dist/${TRAVIS_OS_NAME}/amd64/ooni run --no-collector
+./dist/${OS_NAME}/amd64/ooni onboard --yes
+./dist/${OS_NAME}/amd64/ooni run --no-collector