Provide curl inside images to simplify service discovery registration

Fixes #378.

mainline/alpine-perl/Dockerfile

@@ -100,6 +100,8 @@ RUN set -x \
 # Bring in tzdata so users could set the timezones through the environment
 # variables
     && apk add --no-cache tzdata \
+# Bring in curl and ca-certificates to make registering on DNS SD easier
+    && apk add --no-cache curl ca-certificates \
 # 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 \

mainline/alpine/Dockerfile

@@ -99,6 +99,8 @@ RUN set -x \
 # Bring in tzdata so users could set the timezones through the environment
 # variables
     && apk add --no-cache tzdata \
+# Bring in curl and ca-certificates to make registering on DNS SD easier
+    && apk add --no-cache curl ca-certificates \
 # 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 \

mainline/buster-perl/Dockerfile

@@ -85,7 +85,8 @@ RUN set -x \
     && apt-get install --no-install-recommends --no-install-suggests -y \
                         $nginxPackages \
                         gettext-base \
-    && apt-get remove --purge --auto-remove -y ca-certificates && rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/nginx.list \
+                        curl \
+    && apt-get remove --purge --auto-remove -y && rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/nginx.list \
     \
 # if we have leftovers from building, let's purge them (including extra, unnecessary build deps)
     && if [ -n "$tempDir" ]; then \

mainline/buster/Dockerfile

@@ -84,7 +84,8 @@ RUN set -x \
     && apt-get install --no-install-recommends --no-install-suggests -y \
                         $nginxPackages \
                         gettext-base \
-    && apt-get remove --purge --auto-remove -y ca-certificates && rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/nginx.list \
+                        curl \
+    && apt-get remove --purge --auto-remove -y && rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/nginx.list \
     \
 # if we have leftovers from building, let's purge them (including extra, unnecessary build deps)
     && if [ -n "$tempDir" ]; then \

stable/alpine-perl/Dockerfile

@@ -100,6 +100,8 @@ RUN set -x \
 # Bring in tzdata so users could set the timezones through the environment
 # variables
     && apk add --no-cache tzdata \
+# Bring in curl and ca-certificates to make registering on DNS SD easier
+    && apk add --no-cache curl ca-certificates \
 # 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 \

stable/alpine/Dockerfile

@@ -99,6 +99,8 @@ RUN set -x \
 # Bring in tzdata so users could set the timezones through the environment
 # variables
     && apk add --no-cache tzdata \
+# Bring in curl and ca-certificates to make registering on DNS SD easier
+    && apk add --no-cache curl ca-certificates \
 # 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 \

stable/buster-perl/Dockerfile

@@ -85,7 +85,8 @@ RUN set -x \
     && apt-get install --no-install-recommends --no-install-suggests -y \
                         $nginxPackages \
                         gettext-base \
-    && apt-get remove --purge --auto-remove -y ca-certificates && rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/nginx.list \
+                        curl \
+    && apt-get remove --purge --auto-remove -y && rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/nginx.list \
     \
 # if we have leftovers from building, let's purge them (including extra, unnecessary build deps)
     && if [ -n "$tempDir" ]; then \

stable/buster/Dockerfile

@@ -84,7 +84,8 @@ RUN set -x \
     && apt-get install --no-install-recommends --no-install-suggests -y \
                         $nginxPackages \
                         gettext-base \
-    && apt-get remove --purge --auto-remove -y ca-certificates && rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/nginx.list \
+                        curl \
+    && apt-get remove --purge --auto-remove -y && rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/nginx.list \
     \
 # if we have leftovers from building, let's purge them (including extra, unnecessary build deps)
     && if [ -n "$tempDir" ]; then \