docker: Cache system dependencies installation

Dockerfile

@@ -1,6 +1,18 @@
 # !!! Don't try to build this Dockerfile directly, run it through bin/build-docker.sh script !!!
 FROM node:18.18.2-alpine
 
+# Configure system dependencies
+RUN apk add --no-cache --virtual .build-dependencies \
+    autoconf \
+    automake \
+    g++ \
+    gcc \
+    libtool \
+    make \
+    nasm \
+    libpng-dev \
+    python3 
+
 # Create app directory
 WORKDIR /usr/src/app
 
@@ -11,16 +23,6 @@ COPY server-package.json package.json
 
 # Install app dependencies
 RUN set -x \
-    && apk add --no-cache --virtual .build-dependencies \
-        autoconf \
-        automake \
-        g++ \
-        gcc \
-        libtool \
-        make \
-        nasm \
-        libpng-dev \
-        python3 \
     && npm install \
     && apk del .build-dependencies \
     && npm run webpack \