Migrate CI to actions, build artifacts (#89)

* Create go workflow

* Delete travis config

* Update build script

* Create apple workflow

* Create android workflow

Co-authored-by: marin thiercelin <marin.thiercelin@pm.me>

.github/workflows/android.yml

@@ -0,0 +1,33 @@
+name: Gomobile for Android
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    name: Build library for Android with gomobile
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Build
+      run: |
+        ./build.sh android
+        find build
+
+    - name: Upload Android artifacts
+      uses: actions/upload-artifact@v2
+      with:
+        name: Android build
+        path: build/android
+        if-no-files-found: error