Add drone config

.drone.yml

@@ -0,0 +1,40 @@
+workspace:
+  base: /src
+  path: .
+
+pipeline:
+  build:
+    image: openjdk:8-jdk
+    environment:
+      - ANDROID_COMPILE_SDK=23
+      - ANDROID_BUILD_TOOLS=23.0.1
+      - ANDROID_SDK_TOOLS=24
+    commands:
+      - pwd
+      - chmod +x ./gradlew
+      - export ANDROID_HOME=/src/android-sdk-linux
+      - export PATH=$${PATH}:$${ANDROID_HOME}/platform-tools/
+      - export GRADLE_USER_HOME=/src/.gradle
+      - apt-get --quiet update --yes
+      - apt-get --quiet install --yes wget tar unzip lib32stdc++6 lib32z1
+      - wget --no-clobber --quiet --output-document=android-sdk-$${ANDROID_SDK_TOOLS}.tgz https://dl.google.com/android/android-sdk_r$${ANDROID_SDK_TOOLS}-linux.tgz || true
+      - tar --extract --gzip --file=android-sdk-$${ANDROID_SDK_TOOLS}.tgz
+      - echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter android-$${ANDROID_COMPILE_SDK}
+      - echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter platform-tools
+      - echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter build-tools-$${ANDROID_BUILD_TOOLS}
+      - echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter extra-android-m2repository
+      - echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter extra-google-google_play_services
+      - echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter extra-google-m2repository
+      - mkdir -p $${ANDROID_HOME}/licenses/
+      - echo "8933bad161af4178b1185d1a37fbf41ea5269c55" > $${ANDROID_HOME}/licenses/android-sdk-license
+      - ./gradlew assembleDebug
+
+  upload:
+    image: vividboarder/drone-webdav
+    file: org.fox.ttrss/build/outputs/apk/org.fox.ttrss-debug.apk
+    destination: https://cloud.iamthefij.com/remote.php/dav/files/iamthefij/Android/Apks/
+    secrets:
+      - source: nextclouduser
+        target: PLUGIN_USERNAME
+      - source: nextcloudpassword
+        target: PLUGIN_PASSWORD