ci: enable code coverage

Change-Id: I1fb68bc05b1a4a75c249a11c87fd6139c1700e75
diff --git a/.jenkins.d/30-coverage.sh b/.jenkins.d/30-coverage.sh
new file mode 100755
index 0000000..6048b1c
--- /dev/null
+++ b/.jenkins.d/30-coverage.sh
@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+set -ex
+
+if [[ $JOB_NAME == *"code-coverage" ]]; then
+    lcov --quiet \
+         --capture \
+         --directory . \
+         --no-external \
+         --rc lcov_branch_coverage=1 \
+         --output-file build/coverage-with-tests.info
+
+    lcov --quiet \
+         --remove build/coverage-with-tests.info "$PWD/tests/*" \
+         --rc lcov_branch_coverage=1 \
+         --output-file build/coverage.info
+
+    genhtml --branch-coverage \
+            --demangle-cpp \
+            --legend \
+            --output-directory build/coverage \
+            --title "PSync unit tests" \
+            build/coverage.info
+fi