ci: merge coverage job (#6259)

## Motivation

Merges the code coverage job to the existing `ci` flow for better visibility.

.github/workflows/ci.yml

@@ -171,6 +171,44 @@ jobs:
         timeout-minutes: 5
         run: make build
 
+  coverage:
+    runs-on: ubuntu-22.04
+    needs: filter-changes
+    if: ${{ needs.filter-changes.outputs.nondocchanges == 'true' }}
+    steps:
+      - name: disable TCP/UDP offload
+        run: |
+          sudo ethtool -K eth0 tx off
+          sudo ethtool -K eth0 rx off
+      - uses: actions/checkout@v4
+        with:
+          lfs: true
+          ssh-key: ${{ secrets.GH_ACTION_PRIVATE_KEY }}
+
+      - uses: extractions/netrc@v2
+        with:
+          machine: github.com
+          username: ${{ secrets.GH_ACTION_TOKEN_USER }}
+          password: ${{ secrets.GH_ACTION_TOKEN }}
+        if: vars.GOPRIVATE
+      - name: set up go
+        uses: actions/setup-go@v5
+        with:
+          check-latest: true
+          go-version-file: "go.mod"
+      - name: Add OpenCL support - Ubuntu
+        run: sudo apt-get update -q && sudo apt-get install -qy ocl-icd-opencl-dev libpocl2
+      - name: setup env
+        run: make install
+      - name: test coverage
+        run: make cover
+      - name: Upload to codecov.io
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
   unittests:
     runs-on: ${{ matrix.os }}
     needs: filter-changes