Enable basic GitHub Actions CI

Author: friederbluemle

.github/workflows/ci.yml

@@ -0,0 +1,12 @@
+name: ci
+on: [push, pull_request]
+jobs:
+ build:
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/checkout@v2
+ - uses: actions/setup-java@v1
+ with:
+ java-version: 1.8
+ - uses: gradle/wrapper-validation-action@v1
+ - run: ./gradlew build

README.md

@@ -1,3 +1,7 @@
+# librootjava
+
+[![ci][1]][2]
+
 Example code for "How-To SU"
 
 For some outdated background details, see:
@@ -418,3 +422,6 @@ dependencies {
  implementation 'eu.chainfire:libsuperuser:1.0.0.+'
 }
 ```
+
+[1]: https://github.com/Chainfire/libsuperuser/workflows/ci/badge.svg
+[2]: https://github.com/Chainfire/libsuperuser/actions