CI updates

.github/workflows/gf.yml

@@ -156,6 +156,16 @@ jobs:
         GOARCH=386   go test -v ./... || exit 1
         GOARCH=amd64 go test -v ./... -race -coverprofile=coverage.txt -covermode=atomic -coverpkg=./...,github.com/gogf/gf/... || exit 1
 
+    - name: Merge Coverage
+      run: |
+        for file in `find . -name coverage.txt`; do
+            # In case of recursively incremental selffile in root directory.
+            if [ "./coverage.txt" = $file ]; then
+                continue 1
+            fi
+            cat $file | tail -n +2 >> coverage.txt
+        done
+
     - name: Report Coverage
       uses: codecov/codecov-action@v2
       with: