Refactor integration workflow: streamline Go setup and remove unnecessary build steps

Author: pelikhan

.github/workflows/integration.yml

@@ -24,19 +24,11 @@ jobs:
       GONOSUMDB: github.com/github/*
     steps:
       - uses: actions/checkout@v4
-      
-      - uses: actions/setup-go@v5
+      - name: Setup Go
+        uses: actions/setup-go@v5
         with:
-          go-version: ">=1.22"
-          check-latest: true
-          
-      - name: Build gh-models binary
-        run: make build
-        
+          go-version-file: 'go.mod'
       - name: Run integration tests
-        working-directory: integration
-        run: |
-          go mod tidy
-          go test -v -timeout=5m
+        run: make integration
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}