travis: deploy OSX Metal build

.travis.yml

@@ -38,6 +38,12 @@ matrix:
       osx_image: xcode9.3
       script:
           - xcodebuild -target RetroArch -configuration Release -project pkg/apple/RetroArch_Metal.xcodeproj
+      deploy:
+        skip_cleanup: true
+        provider: script
+        script: bash travis_metal_deploy.sh
+        on:
+          branch: master
 
 script:
   - ./configure

travis_metal_deploy.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+mkdir -p ~/.ssh
+
+chmod 700 ~/.ssh
+
+echo "Decrypting SSH key..."
+
+openssl aes-256-cbc -K $encrypted_e9bb4da59666_key -iv $encrypted_e9bb4da59666_iv -in travis-deploy-key.enc -out ~/.ssh/id_rsa -d
+
+chmod 600 ~/.ssh/id_rsa
+
+echo "Creating DMG image..."
+
+cd ${TRAVIS_BUILD_DIR}/pkg/apple/build/Release
+
+FILENAME=$(date +%F)_RetroArch_Metal.dmg
+
+hdiutil create -volname RetroArch -srcfolder ./ -ov -format UDZO ${FILENAME}
+
+echo "Uploading to server..."
+
+rsync -avhP -e 'ssh -p 12346 -o StrictHostKeyChecking=no' ${FILENAME} travis@bot.libretro.com:~/nightly/apple/osx/x86_64/