Fix remaining CI issues

- Remove lcov dependency from coverage report (we use gcov directly)
- Comment out Codecov upload for now (requires lcov format)
- Simplify coverage reporting in CI to work with our gcov-based script

Author: deftio

.github/workflows/ci.yml

@@ -49,22 +49,24 @@ jobs:
     - name: Generate coverage report
       if: matrix.os == 'ubuntu-latest' && matrix.compiler == 'gcc'
       run: |
-        sudo apt-get update
-        sudo apt-get install -y lcov
         make coverage
         echo "## Coverage Summary" >> $GITHUB_STEP_SUMMARY
         echo '```' >> $GITHUB_STEP_SUMMARY
-        lcov --summary coverage/coverage.info >> $GITHUB_STEP_SUMMARY 2>&1
+        # Our coverage script uses gcov directly and outputs to console
+        # Capture the last part of the output for the summary
+        make coverage 2>&1 | tail -20 >> $GITHUB_STEP_SUMMARY
         echo '```' >> $GITHUB_STEP_SUMMARY
     
-    - name: Upload coverage to Codecov
-      if: matrix.os == 'ubuntu-latest' && matrix.compiler == 'gcc'
-      uses: codecov/codecov-action@v3
-      with:
-        file: ./coverage/coverage.info
-        flags: unittests
-        name: codecov-umbrella
-        fail_ci_if_error: false
+    # Codecov upload disabled for now - our coverage script uses gcov directly
+    # not lcov format. Could be re-enabled if we switch to lcov.
+    #- name: Upload coverage to Codecov
+    #  if: matrix.os == 'ubuntu-latest' && matrix.compiler == 'gcc'
+    #  uses: codecov/codecov-action@v3
+    #  with:
+    #    file: ./coverage/coverage.info
+    #    flags: unittests
+    #    name: codecov-umbrella
+    #    fail_ci_if_error: false
 
   cross-compile:
     runs-on: ubuntu-latest