Add F-Droid nightly job

.github/workflows/fdroid-nightly.yaml

@@ -0,0 +1,57 @@
+name: Publish F-Droid nightly build
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  nightly:
+    name: Publish F-Droid nightly build
+    runs-on: ubuntu-latest
+    environment: nightly
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.0.5'
+          channel: 'stable'
+          cache: true
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'adopt'
+          java-version: 11
+
+      - name: Pub dependency cache
+        uses: actions/cache@v3
+        with:
+          path: $PUB_CACHE
+          key: ${{ runner.os }}-pub-${{ hashFiles('**/pubspec.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-pub-
+      - name: Gradle dependency cache
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
+      - name: Build
+        run: |
+          cd packages/neon
+          flutter build apk
+          cp build/app/outputs/apk/release/app-release.apk app-debug.apk
+
+      - name: Upload
+        run: |
+          sudo add-apt-repository ppa:fdroid/fdroidserver
+          sudo apt-get update
+          sudo apt-get install apksigner fdroidserver tree --no-install-recommends
+          export DEBUG_KEYSTORE=${{ secrets.DEBUG_KEYSTORE }}
+          fdroid nightly -v --archive-older 10 --file app-debug.apk