Add travis script

.travis.yml

@@ -0,0 +1,54 @@
+language: android
+sudo: required
+jdk: openjdk8
+
+notifications:
+  email: false
+
+before_cache:
+  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
+  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
+cache:
+  directories:
+    - $HOME/.gradle/caches/
+    - $HOME/.gradle/wrapper/
+    - $HOME/.android/build-cache
+
+android:
+  components:
+  - tools
+  - platform-tools
+  - build-tools-28.0.3
+  - android-28
+  - extra-google-m2repository
+  - extra-android-m2repository
+  licenses:
+  - android-sdk-preview-license-.+
+  - android-sdk-license-.+
+  - google-gdk-license-.+
+
+before_install:
+- yes | sdkmanager "platforms;android-28"
+- openssl aes-256-cbc -K $encrypted_f6e0f94759d3_key -iv $encrypted_f6e0f94759d3_iv
+  -in gotify-release-key.jks.enc -out gotify-release-key.jks -d
+
+script:
+- ./gradlew clean build --stacktrace
+
+before_deploy:
+- cp $TRAVIS_BUILD_DIR/gotify-release-key.jks $HOME
+- cd app/build/outputs/apk/release
+- jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore $HOME/gotify-release-key.jks
+  -storepass $STOREPASS -keypass $KEYPASS app-release-unsigned.apk gotify-release-key
+- jarsigner -verify app-release-unsigned.apk
+- "${ANDROID_HOME}/build-tools/28.0.3/zipalign -v 4 app-release-unsigned.apk Gotify.apk"
+
+deploy:
+  provider: releases
+  file: Gotify.apk
+  api_key: $GH_TOKEN
+  skip_cleanup: true
+  on:
+    repo: gotify/android
+    tags: true
+    jdk: openjdk8