explicit build dirs

.travis.yml

@@ -22,10 +22,10 @@ before_deploy:
 deploy:
   - provider: script
     skip_cleanup: true
-    script: cd $TEST_DIR && ./deploy.sh
+    script: cd cd $TRAVIS_BUILD_DIR/$TEST_DIR && ./deploy.sh
     on:
       repo: 10thmagnitude/terraform
       branch: topic-101-vm-simple-linux
 
 # destroy resources with Azure CLI
-after_deploy: ./after_deploy.sh
+after_deploy: cd $TRAVIS_BUILD_DIR/$TEST_DIR && ./after_deploy.sh