Use mkdir(1) just once.

The mkdir(1) utility support multiple arguments, so it's possible
to use it once to create more than one directory.

build/Dockerfile

@@ -9,8 +9,8 @@ RUN ln -sf /proc/1/fd/1 /var/log/nginx/access.log \
 	&& ln -sf /proc/1/fd/2 /var/log/nginx/error.log
 
 RUN mkdir -p /var/lib/nginx \
-	&& mkdir -p /etc/nginx/secrets \
-	&& mkdir -p /etc/nginx/stream-conf.d \
+	     /etc/nginx/secrets \
+	     /etc/nginx/stream-conf.d \
 	&& apt-get update \
 	&& apt-get install -y libcap2-bin \
 	&& setcap 'cap_net_bind_service=+ep' /usr/sbin/nginx \

build/DockerfileForAlpine

@@ -10,7 +10,7 @@ RUN ln -sf /proc/1/fd/1 /var/log/nginx/access.log \
 
 RUN mkdir -p /etc/nginx/secrets \
 	&& mkdir -p /etc/nginx/stream-conf.d \
-	&& mkdir -p /var/lib/nginx \
+		    /var/lib/nginx \
 	&& apk add --no-cache libcap \
 	&& setcap 'cap_net_bind_service=+ep' /usr/sbin/nginx \
 	          'cap_net_bind_service=+ep' /usr/sbin/nginx-debug \

build/DockerfileForPlus

@@ -52,8 +52,8 @@ RUN ln -sf /proc/1/fd/1 /var/log/nginx/access.log \
 	&& ln -sf /proc/1/fd/2 /var/log/nginx/error.log
 
 RUN mkdir -p /var/lib/nginx \
-	&& mkdir -p /etc/nginx/secrets \
-	&& mkdir -p /etc/nginx/stream-conf.d \
+	     /etc/nginx/secrets \
+	     /etc/nginx/stream-conf.d \
 	&& chown -R nginx:0 /etc/nginx \
 	&& chown -R nginx:0 /var/cache/nginx \
 	&& chown -R nginx:0 /var/lib/nginx/ \

build/DockerfileWithOpentracing

@@ -75,8 +75,8 @@ COPY --from=tracer-downloader /usr/local/lib/libjaegertracing_plugin.so /usr/loc
 RUN ldconfig
 
 RUN mkdir -p /var/lib/nginx \
-	&& mkdir -p /etc/nginx/secrets \
-	&& mkdir -p /etc/nginx/stream-conf.d \
+	     /etc/nginx/secrets \
+	     /etc/nginx/stream-conf.d \
 	&& apt-get update \
 	&& apt-get install -y libcap2-bin \
 	&& setcap 'cap_net_bind_service=+ep' /usr/sbin/nginx \

build/DockerfileWithOpentracingForPlus

@@ -68,8 +68,8 @@ RUN ln -sf /proc/1/fd/1 /var/log/nginx/access.log \
 COPY --from=tracer-downloader /usr/local/lib/libjaegertracing_plugin.so /usr/local/lib/libjaegertracing_plugin.so
 
 RUN mkdir -p /var/lib/nginx \
-	&& mkdir -p /etc/nginx/secrets \
-	&& mkdir -p /etc/nginx/stream-conf.d \
+	     /etc/nginx/secrets \
+	     /etc/nginx/stream-conf.d \
 	&& chown -R nginx:0 /etc/nginx \
 	&& chown -R nginx:0 /var/cache/nginx \
 	&& chown -R nginx:0 /var/lib/nginx/ \

build/appprotect/DockerfileWithAppProtectForPlus

@@ -75,13 +75,13 @@ RUN ln -sf /proc/1/fd/1 /var/log/nginx/access.log \
 	&& ln -sf /proc/1/fd/2 /var/log/nginx/error.log
 
 RUN  mkdir -p /var/lib/nginx \
-	&& mkdir -p /etc/nginx/stream-conf.d \
-	&& mkdir -p /etc/nginx/secrets \
-	&& mkdir -p /etc/nginx/waf \
-	&& mkdir -p /etc/nginx/waf/nac-policies \
-	&& mkdir -p /etc/nginx/waf/nac-logconfs \
-	&& mkdir -p /var/log/app_protect \
-	&& mkdir -p /opt/app_protect \
+	      /etc/nginx/stream-conf.d \
+	      /etc/nginx/secrets \
+	      /etc/nginx/waf \
+	      /etc/nginx/waf/nac-policies \
+	      /etc/nginx/waf/nac-logconfs \
+	      /var/log/app_protect \
+	      /opt/app_protect \
 	&& chown -R nginx:0 /etc/app_protect \
 	&& chown -R nginx:0 /usr/share/ts \
 	&& chown -R nginx:0 /etc/nginx \

build/appprotect/DockerfileWithAppProtectForPlusForOpenShift

@@ -75,13 +75,13 @@ RUN ln -sf /proc/1/fd/1 /var/log/nginx/access.log \
 	&& ln -sf /proc/1/fd/2 /var/log/nginx/error.log
 
 RUN  mkdir -p /var/lib/nginx \
-	&& mkdir -p /etc/nginx/stream-conf.d \
-	&& mkdir -p /etc/nginx/secrets \
-	&& mkdir -p /etc/nginx/waf \
-	&& mkdir -p /etc/nginx/waf/nac-policies \
-	&& mkdir -p /etc/nginx/waf/nac-logconfs \
-	&& mkdir -p /var/log/app_protect \
-	&& mkdir -p /opt/app_protect \
+	      /etc/nginx/stream-conf.d \
+	      /etc/nginx/secrets \
+	      /etc/nginx/waf \
+	      /etc/nginx/waf/nac-policies \
+	      /etc/nginx/waf/nac-logconfs \
+	      /var/log/app_protect \
+	      /opt/app_protect \
 	&& chown -R nginx:0 /etc/app_protect \
 	&& chown -R nginx:0 /usr/share/ts \
 	&& chown -R nginx:0 /etc/nginx \

build/openshift/Dockerfile

@@ -22,8 +22,8 @@ RUN set -x \
 	&& echo "module_hotfixes=true" >> /etc/yum.repos.d/nginx.repo \
 	&& yum install -y nginx-${NGINX_VERSION} \
 	&& mkdir -p /var/lib/nginx \
-	&& mkdir -p /etc/nginx/secrets \
-	&& mkdir -p /etc/nginx/stream-conf.d \
+		    /etc/nginx/secrets \
+		    /etc/nginx/stream-conf.d \
 	&& setcap 'cap_net_bind_service=+ep' /usr/sbin/nginx \
 	          'cap_net_bind_service=+ep' /usr/sbin/nginx-debug \
 	&& chown -R nginx:0 /etc/nginx \

build/openshift/DockerfileForPlus

@@ -59,8 +59,8 @@ RUN ln -sf /proc/1/fd/1 /var/log/nginx/access.log \
 	&& ln -sf /proc/1/fd/2 /var/log/nginx/error.log
 
 RUN mkdir -p /var/lib/nginx \
-	&& mkdir -p /etc/nginx/secrets \
-	&& mkdir -p /etc/nginx/stream-conf.d \
+	     /etc/nginx/secrets \
+	     /etc/nginx/stream-conf.d \
 	&& chown -R nginx:0 /etc/nginx \
 	&& chown -R nginx:0 /var/cache/nginx \
 	&& chown -R nginx:0 /var/lib/nginx/ \