Try a GitHub Actions setup

Author: dwijnand

.github/workflows/ci.yml

@@ -0,0 +1,52 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: ['main']
+    tags: ['v[0-9]']
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        java: [adopt@1.8, adopt@1.11]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: olafurpg/setup-scala@v13
+        with:
+          java-version: ${{ matrix.java }}
+      - uses: coursier/cache-action@v6
+      - run: "sbt test mimaReportBinaryIssues 'set sbtplugin/scriptedSbt := \"1.2.8\"' 'scripted sbt-mima-plugin/minimal' IntegrationTest/test"
+  testFunctional:
+    needs: build
+    strategy:
+      fail-fast: false
+      matrix:
+        scala: [2.11, 2.12, 2.13, 3]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: olafurpg/setup-scala@v13
+      - uses: coursier/cache-action@v6
+      - run: |
+          case ${{ matrix.scala }} in
+            2.11) sbt "functional-tests/runMain com.typesafe.tools.mima.lib.UnitTests -211" ;;
+            2.12) sbt "functional-tests/runMain com.typesafe.tools.mima.lib.UnitTests -212" ;;
+            2.13) sbt "functional-tests/runMain com.typesafe.tools.mima.lib.UnitTests -213" ;;
+               3) sbt "functional-tests/runMain com.typesafe.tools.mima.lib.UnitTests -3"   ;;
+          esac
+  testScripted:
+    needs: build
+    strategy:
+      fail-fast: false
+      matrix:
+        scripted: [1of2, 2of2]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: olafurpg/setup-scala@v13
+      - uses: coursier/cache-action@v6
+      - run: sbt "scripted sbt-mima-plugin/*${{ matrix.scripted }}"