[+] improve "build" GHA workflow

Author: pashagolub

.github/workflows/build.yml

@@ -30,70 +30,20 @@ jobs:
       uses: actions/setup-go@v6
       with:
         go-version: '1.25'
+        cache-dependency-path: 'go.sum'
 
-    - name: Cache Go modules
-      uses: actions/cache@v4
-      with:
-        path: |
-          ~/.cache/go-build
-          ~/go/pkg/mod
-        key: ${{ runner.os }}-go-1.25-${{ hashFiles('**/go.sum') }}
-        restore-keys: |
-          ${{ runner.os }}-go-1.25-
-          ${{ runner.os }}-go-
-
-    - name: Download dependencies
-      run: go mod download
+    - name: Build
+      run: go build ./cmd/etcd_fdw
 
-    - name: Verify dependencies
-      run: go mod verify
+    - name: GolangCI-Lint
+      uses: golangci/golangci-lint-action@v8
+      with:
+        version: latest      
 
     - name: Run tests
       run: go test -v -race -coverprofile=coverage.out ./...
-      # Note: Integration tests run via testcontainers (no separate services needed)
-
-    - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v5
-      with:
-        file: ./coverage.out
-        flags: unittests
-        name: codecov-umbrella
-
-  build:
-    name: Build
-    runs-on: ubuntu-latest
-    needs: test
 
-    steps:
-    - name: Check out code
-      uses: actions/checkout@v5
-
-    - name: Set up Go
-      uses: actions/setup-go@v6
-      with:
-        go-version: '1.25'
-
-    - name: Build binary
-      run: go build -v ./cmd/etcd_fdw
-
-    - name: Test binary execution
-      run: ./etcd_fdw --version
-
-  lint:
-    name: Lint
-    runs-on: ubuntu-latest
-
-    steps:
-    - name: Check out code
-      uses: actions/checkout@v5
-
-    - name: Set up Go
-      uses: actions/setup-go@v6
-      with:
-        go-version: '1.25'
-
-    - name: Run golangci-lint
-      uses: golangci/golangci-lint-action@v8
+    - name: Coveralls
+      uses: coverallsapp/github-action@v2
       with:
-        version: latest
-        args: --timeout=5m
+        file: coverage.out