ci: integrate coverage into linux arch job, remove duplicate

- Linux arch job now uploads coverage.info as artifact
- ci-build.sh saves coverage.info before cleanup
- Removed separate coverage job (was duplicating arch build)
- Saves ~25% CI time by eliminating redundant build

ci-build.sh

@@ -221,7 +221,7 @@ build_and_test() {
             exit 1
         fi
 
-        # Run unit tests under Valgrind
+        # Run unit tests
         local unit_passed=0 unit_failed=0
         if [ "$run_valgrind" = "yes" ]; then
             echo "--> Running unit tests under Valgrind..."
@@ -236,13 +236,21 @@ build_and_test() {
                 echo "ERROR: Valgrind unit tests failed (exit code $valgrind_exit)"
                 exit 1
             fi
-            # Extract unit test counts from cmocka output
-            unit_passed=$(grep -E "^\[  PASSED  \] [0-9]+ test" unit-tests-output.log | grep -oE "[0-9]+" | head -1)
-            unit_failed=$(grep -E "^\[  FAILED  \] [0-9]+ test" unit-tests-output.log | grep -oE "[0-9]+" | head -1)
-            [ -z "$unit_passed" ] && unit_passed=0
-            [ -z "$unit_failed" ] && unit_failed=0
-            echo "UNIT_TESTS: passed=$unit_passed failed=$unit_failed"
+        else
+            echo "--> Running unit tests..."
+            $MAKE tests/unittests/unittests
+            tests/unittests/unittests 2>&1 | tee unit-tests-output.log
+            if [ ${PIPESTATUS[0]} -ne 0 ]; then
+                echo "ERROR: Unit tests failed"
+                exit 1
+            fi
         fi
+        # Extract unit test counts from cmocka output
+        unit_passed=$(grep -E "^\[  PASSED  \] [0-9]+ test" unit-tests-output.log | grep -oE "[0-9]+" | head -1)
+        unit_failed=$(grep -E "^\[  FAILED  \] [0-9]+ test" unit-tests-output.log | grep -oE "[0-9]+" | head -1)
+        [ -z "$unit_passed" ] && unit_passed=0
+        [ -z "$unit_failed" ] && unit_failed=0
+        echo "UNIT_TESTS: passed=$unit_passed failed=$unit_failed"
 
         # Set build index for port allocation: build 1 uses ports 5230-5233,
         # build 2 uses 5234-5237, etc. This prevents port conflicts in parallel builds.