exception safety, github actions and scalafmt

.github/workflows/run-tests.yml

@@ -0,0 +1,22 @@
+name: tests
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  run-tests:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup JDK
+        uses: actions/setup-java@v2
+        with:
+          distribution: temurin
+          java-version: 8
+      - name: Build and Test
+        run: sbt -v +test