Migrate to GitHub Actions (#54)

.github/PULL_REQUEST_TEMPLATE.md

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+*Issue #, if available:*
+
+*Description of changes:*
+
+
+By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

.github/no-response.yml

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+# Configuration for probot-no-response - https://github.com/probot/no-response
+
+# Number of days of inactivity before an Issue is closed for lack of response
+daysUntilClose: 14
+# Label requiring a response
+responseRequiredLabel: more-information-needed
+# Comment to post when closing an Issue for lack of response. Set to `false` to disable
+closeComment: >
+  This issue has been automatically closed because there has been no response
+  to our request for more information from the original author. With only the
+  information that is currently in the issue, we don't have enough information
+  to take action. Please reach out if you have or find the answers we need so
+  that we can investigate further.

.github/workflows/build.yml

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+name: "Build and run tests"
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [ 8, 9, 10, 11 ]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Java ${{ matrix.java }}
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java }}
+      - name: Build and test
+        run: ./gradlew build