chore: added CI

.github/workflows/ci.yml

@@ -0,0 +1,46 @@
+name: ci
+
+on:
+  pull_request:
+    branches:
+      - main
+      - backend
+
+jobs:
+  tests:
+    name: Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.24.4'
+
+      - name: Run unit tests
+        run: go test ./... -cover
+
+  style:
+    name: Style
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.24.4'
+
+      - name: Check formatting
+        run: test -z $(go fmt ./...)
+
+      - name: Install staticcheck
+        run: go install honnef.co/go/tools/cmd/staticcheck@latest
+
+      - name: Run staticcheck
+        run: staticcheck ./...