ci: fix coverage

Author: neolynx

.github/workflows/ci.yml

@@ -134,8 +134,9 @@ jobs:
 
       - name: "Merge Code Coverage"
         run: |
-          go install github.com/wadey/gocovmerge@v0.0.0-20160331181800-b5bfa59ec0ad
-          ~/go/bin/gocovmerge coverage/*.out > coverage.txt
+          # go install github.com/wadey/gocovmerge@v0.0.0-20160331181800-b5bfa59ec0ad
+          # ~/go/bin/gocovmerge coverage/*.out > coverage.txt
+          awk 'FNR==1 && NR!=1 {next} {print}' coverage/*.out > coverage.txt
 
       - name: "Upload Code Coverage"
         uses: codecov/codecov-action@v5