ci: use gcovr 5.0 to generate code coverage reports

Add badges to README.md

Change-Id: I7c5b2c6fc39654e4552c3ccfc11f2a2c0cdc4d34
diff --git a/.jenkins b/.jenkins
index 1a12b6c..21cce49 100755
--- a/.jenkins
+++ b/.jenkins
@@ -2,6 +2,9 @@
 set -e
 source .jenkins.d/util.sh
 
+if has Linux $NODE_LABELS; then
+    export PATH="~/.local/bin${PATH:+:}${PATH}"
+fi
 export CACHE_DIR=${CACHE_DIR:-/tmp}
 export WAF_JOBS=${WAF_JOBS:-1}
 [[ $JOB_NAME == *"code-coverage" ]] && export DISABLE_ASAN=yes