use less layers

Dockerfile

@@ -5,17 +5,13 @@ ENV NGINX_RTMP_MODULE_VERSION 1.2.1
 
 RUN apt-get update && \
     apt-get install -y ca-certificates openssl libssl-dev ffmpeg && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
-
-RUN mkdir -p /tmp/build/ && \
+    apt-get clean && rm -rf /var/lib/apt/lists/* && \
+    mkdir -p /tmp/build/ && \
     cd /tmp/build/ && \
     wget -O ${NGINX_VERSION}.tar.gz https://nginx.org/download/${NGINX_VERSION}.tar.gz && \
-    tar -zxf ${NGINX_VERSION}.tar.gz
-
-RUN cd /tmp/build/ && \
-    git clone https://github.com/sergey-dryabzhinsky/nginx-rtmp-module.git
-
-RUN cd /tmp/build/${NGINX_VERSION} && \
+    tar -zxf ${NGINX_VERSION}.tar.gz &&\
+    git clone https://github.com/sergey-dryabzhinsky/nginx-rtmp-module.git &&\
+    cd /tmp/build/${NGINX_VERSION} && \
     ./configure \
         --sbin-path=/usr/local/sbin/nginx \
         --conf-path=/etc/nginx/nginx.conf \
@@ -36,13 +32,12 @@ RUN cd /tmp/build/${NGINX_VERSION} && \
         --with-compat \
         --add-module=../nginx-rtmp-module \
         --with-debug\
-        -builddir=/tmp/build/${NGINX_VERSION} \
+        --builddir=/tmp/build/${NGINX_VERSION} \
     make -j $(getconf _NPROCESSORS_ONLN) && \
     make install && \
     mkdir /var/lock/nginx && \
-    rm -rf /tmp/build
-
-RUN ln -sf /dev/stdout /var/log/nginx/access.log && \
+    rm -rf /tmp/build && \
+    ln -sf /dev/stdout /var/log/nginx/access.log && \
     ln -sf /dev/stderr /var/log/nginx/error.log
 
 COPY startscript.sh /usr/sbin/startscript.sh