build: check repo name and build type to skip deploy on PR and forks

.travis.yml

@@ -31,10 +31,10 @@ jobs:
   include:
     - stage: deploy-unstable
       jdk: openjdk8
-      if: branch = master AND env(BINTRAY_KEY) IS present
+      if: branch = master AND repo = env(MAIN_REPO) AND type = push
       script: bash scripts/travis-master.sh
 
     - stage: deploy-release
       jdk: openjdk8
-      if: branch = release AND env(GH_TOKEN) IS present
+      if: branch = release AND repo = env(MAIN_REPO) AND type = push
       script: bash scripts/travis-release.sh