Actions 백엔드 테스트 커버리지 워크플로우 추가

.gitea/coverage.json

@@ -0,0 +1,7 @@
+{
+    "Path": "./backend/coverage.out",
+    "Thresholds": {
+        "baron-sso-backend/internal/handler": 90,
+        "baron-sso-backend/internal/service": 90
+    }
+}

.gitea/workflows/backend_coverage_check.yml

@@ -0,0 +1,29 @@
+name: Backend Test Coverage Check
+
+on:
+  push:
+    branches:
+      - dev
+
+jobs:
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.25"
+          cache-dependency-path: backend/go.sum
+
+      - name: Run tests with coverage
+        working-directory: ./backend
+        run: |
+          go test -v -coverprofile=coverage.out -covermode=atomic ./internal/handler/... ./internal/service/...
+
+      - name: Check coverage
+        uses: vladopajic/go-test-coverage@v2
+        with:
+          config: ./.gitea/coverage.json