Use jq for parsing config in healthcheck

build/worker/Dockerfile

@@ -85,6 +85,7 @@ RUN apt-get update \
     wkhtmltopdf \
     # For healthcheck.sh in helm chart
     wait-for-it \
+    jq \
     # other
     nodejs \
     && rm -rf /var/lib/apt/lists/*

build/worker/healthcheck.sh

@@ -2,7 +2,7 @@
 set -e
 
 get_key() {
-  grep "$1" /home/frappe/frappe-bench/sites/common_site_config.json | awk -v word="$1" '$word { gsub(/[",]/,"",$2); print $2}' | tr -d '\n'
+  jq -r ".$1" /home/frappe/frappe-bench/sites/common_site_config.json
 }
 
 get_redis_url() {