Add signing to Drone

.drone.yml

@@ -6,7 +6,19 @@ steps:
   - name: build
     image: mingc/android-build-box
     commands:
-      - sh gradlew build bundle
+      - curl -sSL -u "${USERNAME}:${PASSWORD}" -o ${KEYFILE} https://cloud.crystalyx.net/remote.php/dav/files/${USERNAME}/Bordel/${KEYFILE}
+      - sh gradlew build bundle -Pandroid.injected.signing.store.file=${KEYFILE} -Pandroid.injected.signing.store.password=${KEYPASS} -Pandroid.injected.signing.store.key.alias=${KEYALIAS} -Pandroid.injected.signing.store.key.password=${KEYPASS}
+    environment:
+      USERNAME:
+        from_secret: nextcloud_user
+      PASSWORD:
+        from_secret: nextcloud_password
+      KEYFILE:
+        from_secret: android_keyfile
+      KEYALIAS:
+        from_secret: android_keyalias
+      KEYPASS:
+        from_secret: android_keypass
   - name: release
     image: plugins/gitea-release
     settings: