Forward request and error logs to docker log collector

docker/Dockerfile

@@ -22,7 +22,10 @@ COPY artifacts/*.rpm /pkgs/
 COPY nginx.repo /etc/yum.repos.d/nginx.repo
 RUN rpm -ivh /pkgs/nginx-httpg-1.24.0-1.el7.ngx.x86_64.rpm && \
     rpm -ivh /pkgs/nginx-module-http-voms-1.24.0-1.el7.x86_64.rpm && \
-    yum install -y nginx-module-njs
+    yum install -y nginx-module-njs \
+# forward request and error logs to docker log collector
+    && ln -sf /dev/stdout /var/log/nginx/access.log \
+    && ln -sf /dev/stderr /var/log/nginx/error.log
 
 # install nginx + voms and njs dynamic modules
 # RUN yum -y install nginx nginx-module-njs && \