Add GitHub Actions workflow

.github/scripts/gradlew_recursive.sh

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+#!/bin/bash
+
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -xe
+
+# Default Gradle settings are not optimal for Android builds, override them
+# here to make the most out of the GitHub Actions build servers
+GRADLE_OPTS="$GRADLE_OPTS -Xms4g -Xmx4g"
+GRADLE_OPTS="$GRADLE_OPTS -XX:+HeapDumpOnOutOfMemoryError"
+GRADLE_OPTS="$GRADLE_OPTS -Dorg.gradle.daemon=false"
+GRADLE_OPTS="$GRADLE_OPTS -Dorg.gradle.workers.max=2"
+GRADLE_OPTS="$GRADLE_OPTS -Dkotlin.incremental=false"
+GRADLE_OPTS="$GRADLE_OPTS -Dkotlin.compiler.execution.strategy=in-process"
+GRADLE_OPTS="$GRADLE_OPTS -Dfile.encoding=UTF-8"
+export GRADLE_OPTS
+
+# Crawl all gradlew files which indicate an Android project
+# You may edit this if your repo has a different project structure
+for GRADLEW in `find . -name "gradlew"` ; do
+    SAMPLE=$(dirname "${GRADLEW}")
+    # Tell Gradle that this is a CI environment and disable parallel compilation
+    bash "$GRADLEW" -p "$SAMPLE" -Pci --no-parallel --stacktrace $@
+done

.github/workflows/android.yml

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+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Android CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+
+  build:
+    name: Build
+    runs-on: ubuntu-18.04
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Build project
+        run: .github/scripts/gradlew_recursive.sh assembleDebug
+      - name: Zip artifacts
+        run: zip -r assemble.zip . -i '**/build/*.apk' '**/build/*.aab' '**/build/*.aar' '**/build/*.so'
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v1
+        with:
+          name: assemble
+          path: assemble.zip