Testing GitHub Actions

Author: mpilquist

.github/workflows/build.yml

@@ -0,0 +1,22 @@
+name: CI
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        scala: [2.12.10, 2.13.1, 0.22.0-bin-20200123-9982f0d-NIGHTLY]
+    steps:
+    - uses: actions/checkout@v2
+    - uses: olafurpg/setup-scala@v5
+      with:
+        java-version: [email protected]
+    - name: Format Check
+      if: matrix.scala == "2.13.1"
+      run: sbt ++${{matrix.scala}} fmtCheck
+    - name: Tests
+      run: sbt ++${{matrix.scala}} test
+    - name: Mima
+      run: sbt ++${{matrix.scala}} mimaReportBinaryIssues