Made the UID/GID consistent throughout the variants.

101 was chosen as UID/GID for both supported platforms since that's the
first unused pair.

This also looks forward compatible at least for now with Debian Buster
and Alpine 3.10 as from the :edge tag of the time writing this message.

Fixes: nginx#218.

Author: thresheek

mainline/alpine-perl/Dockerfile

@@ -7,6 +7,9 @@ ENV NJS_VERSION   0.3.2
 ENV PKG_RELEASE 1
 
 RUN set -x \
+# create nginx user/group first, to be consistent throughout docker variants
+    && addgroup -g 101 -S nginx \
+    && adduser -S -D -H -u 101 -h /var/cache/nginx -s /sbin/nologin -G nginx -g nginx nginx \
     && apkArch="$(cat /etc/apk/arch)" \
     && nginxPackages=" \
         nginx=${NGINX_VERSION}-r${PKG_RELEASE} \

mainline/alpine/Dockerfile

@@ -7,6 +7,9 @@ ENV NJS_VERSION   0.3.2
 ENV PKG_RELEASE 1
 
 RUN set -x \
+# create nginx user/group first, to be consistent throughout docker variants
+    && addgroup -g 101 -S nginx \
+    && adduser -S -D -H -u 101 -h /var/cache/nginx -s /sbin/nologin -G nginx -g nginx nginx \
     && apkArch="$(cat /etc/apk/arch)" \
     && nginxPackages=" \
         nginx=${NGINX_VERSION}-r${PKG_RELEASE} \

mainline/stretch-perl/Dockerfile

@@ -7,6 +7,9 @@ ENV NJS_VERSION     0.3.2
 ENV PKG_RELEASE     1~stretch
 
 RUN set -x \
+# create nginx user/group first, to be consistent throughout docker variants
+    && addgroup --system --gid 101 nginx \
+    && adduser --system --disabled-login --ingroup nginx --no-create-home --home /nonexistent --gecos "nginx user" --shell /bin/false --uid 101 nginx \
 	&& apt-get update \
 	&& apt-get install --no-install-recommends --no-install-suggests -y gnupg1 apt-transport-https ca-certificates \
 	&& \

mainline/stretch/Dockerfile

@@ -7,6 +7,9 @@ ENV NJS_VERSION     0.3.2
 ENV PKG_RELEASE     1~stretch
 
 RUN set -x \
+# create nginx user/group first, to be consistent throughout docker variants
+    && addgroup --system --gid 101 nginx \
+    && adduser --system --disabled-login --ingroup nginx --no-create-home --home /nonexistent --gecos "nginx user" --shell /bin/false --uid 101 nginx \
 	&& apt-get update \
 	&& apt-get install --no-install-recommends --no-install-suggests -y gnupg1 apt-transport-https ca-certificates \
 	&& \

stable/alpine-perl/Dockerfile

@@ -7,6 +7,9 @@ ENV NJS_VERSION   0.3.2
 ENV PKG_RELEASE 1
 
 RUN set -x \
+# create nginx user/group first, to be consistent throughout docker variants
+    && addgroup -g 101 -S nginx \
+    && adduser -S -D -H -u 101 -h /var/cache/nginx -s /sbin/nologin -G nginx -g nginx nginx \
     && apkArch="$(cat /etc/apk/arch)" \
     && nginxPackages=" \
         nginx=${NGINX_VERSION}-r${PKG_RELEASE} \

stable/alpine/Dockerfile

@@ -7,6 +7,9 @@ ENV NJS_VERSION   0.3.2
 ENV PKG_RELEASE 1
 
 RUN set -x \
+# create nginx user/group first, to be consistent throughout docker variants
+    && addgroup -g 101 -S nginx \
+    && adduser -S -D -H -u 101 -h /var/cache/nginx -s /sbin/nologin -G nginx -g nginx nginx \
     && apkArch="$(cat /etc/apk/arch)" \
     && nginxPackages=" \
         nginx=${NGINX_VERSION}-r${PKG_RELEASE} \

stable/stretch-perl/Dockerfile

@@ -7,6 +7,9 @@ ENV NJS_VERSION     0.3.2
 ENV PKG_RELEASE     1~stretch
 
 RUN set -x \
+# create nginx user/group first, to be consistent throughout docker variants
+    && addgroup --system --gid 101 nginx \
+    && adduser --system --disabled-login --ingroup nginx --no-create-home --home /nonexistent --gecos "nginx user" --shell /bin/false --uid 101 nginx \
 	&& apt-get update \
 	&& apt-get install --no-install-recommends --no-install-suggests -y gnupg1 apt-transport-https ca-certificates \
 	&& \

stable/stretch/Dockerfile

@@ -7,6 +7,9 @@ ENV NJS_VERSION     0.3.2
 ENV PKG_RELEASE     1~stretch
 
 RUN set -x \
+# create nginx user/group first, to be consistent throughout docker variants
+    && addgroup --system --gid 101 nginx \
+    && adduser --system --disabled-login --ingroup nginx --no-create-home --home /nonexistent --gecos "nginx user" --shell /bin/false --uid 101 nginx \
 	&& apt-get update \
 	&& apt-get install --no-install-recommends --no-install-suggests -y gnupg1 apt-transport-https ca-certificates \
 	&& \