Fixed JWT and added tests for the gatekeeper

api_auth_docker/Dockerfile

@@ -1,13 +1,14 @@
 FROM nginx:1.18.0-alpine
 
 RUN apk add --update --no-cache \
-		bash \
+    bash \
     git \
     openssl \
     fcgiwrap \
     spawn-fcgi \
     curl \
-    jq
+    jq \
+    coreutils
 
 COPY auth.sh /etc/nginx/conf.d/
 COPY default.conf /etc/nginx/conf.d/default.conf