Migrate build from Travis CI to GitHub

Travis can barely handle builds that involve the Android emulator, anything above API level 19 doesn't even seem to start. GitHub Actions seems to do a better job.

Author: Rolf-Smit

.github/workflows/build_and_test.yml

@@ -0,0 +1,20 @@
+name: Build and Test
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    timeout-minutes: 40
+    runs-on: macOS-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          # Robolectric requires Java 9 to emulate Android API level 30
+          java-version: '9'
+      - name: test
+        uses: reactivecircus/android-emulator-runner@v2
+        with:
+          api-level: 28
+          script: ./gradlew clean test --stacktrace

plugin/build.gradle

@@ -37,8 +37,11 @@ publishing {
             name = "mavenCentral"
             credentials {
                 Properties properties = new Properties()
-                properties.load(project.rootProject.file('local.properties').newDataInputStream())
-
+                try {
+                    properties.load(project.rootProject.file('local.properties').newDataInputStream())
+                } catch(FileNotFoundException ignored) {
+                    logger.warn("local.properties file with ossrhUsername and ossrhPassword properties was not found.")
+                }
                 username = properties.getProperty("ossrhUsername")
                 password = properties.getProperty("ossrhPassword")
             }

plugin/src/test/test-fixtures/multi-module/build.gradle

@@ -26,6 +26,11 @@ allprojects {
         google()
         mavenCentral()
     }
+    tasks.withType(Test) {
+        testLogging {
+            exceptionFormat "full"
+        }
+    }
 }
 
 task clean(type: Delete) {