add droneci build

.ci/prepare-publish.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+find -type d -name "siacs" -print0 | xargs --null -I{} bash -c 'x="{}"; mv "$x" "${x/siacs/sum7}" '
+find -type f -name "*.java" -exec sed -i "/eu.siacs.conversations.axolotl/! s/eu.siacs./eu.sum7./" "{}" \;
+find -type f -name "*.xml"  -exec sed -i "/eu.siacs.conversations.axolotl/! s/eu.siacs./eu.sum7./" "{}" \;
+# workaround for bug in fdroid nightly
+sed -i "s/-debug.apk/-unsigned.apk/" /usr/lib/python3/dist-packages/fdroidserver/nightly.py
+# generate new version
+git fetch --tags
+export versionCode="$DRONE_BUILD_NUMBER"
+export versionName="$(git describe --tag --abbrev=0)-${DRONE_BUILD_NUMBER}"
+echo "set VersionCode '${versionCode}' and VersonName '${versionName}'"
+sed -i "s/^\(\s*versionCode\s*\).*$/\1$versionCode/" build.gradle
+sed -i "0,/versionName/s/^\(\s*versionName\).*/\1 \"$versionName\"/" build.gradle
+cat -n build.gradle

.drone.yml

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+---
+kind: pipeline
+type: docker
+name: default
+
+steps:
+- image: registry.gitlab.com/fdroid/ci-images-client:latest
+  name: build
+  when:
+    branch:
+      exclude:
+      - droneci
+  commands:
+  - ./gradlew assembleConversationsFreeCompatDebug
+
+- image: registry.gitlab.com/fdroid/ci-images-client:latest
+  name: publish
+  when:
+    branch:
+      include:
+      - droneci
+  environment:
+    DEBUG_KEYSTORE:
+      from_secret: DEBUG_KEYSTORE
+  commands:
+  - .ci/prepare-publish.sh
+  # build free version
+  - ./gradlew assembleConversationsFreeCompatRelease
+  - ls build/outputs/apk/conversationsFreeCompat/*
+  # publish on nightly fdroid repo
+  - fdroid nightly -v