build: Create ci.yml

Co-authored-by: Sverre Nystad <89105607+SverreNystad@users.noreply.github.com>

.github/workflows/ci.yml

@@ -0,0 +1,20 @@
+name: CI
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+    steps:
+      - uses: actions/checkout@v3
+      - name: Build docker image and run tests
+        run: |
+          docker compose build
+          docker compose up -d
+          docker compose down