refs #41, #5: Update NodeJS kernel to use compiled packages

 * Just noticed that pkgs.alpinelinux.org has latest nodejs package
   updates on its front page....

 * This reduce the image build time A LOT.

 * The image size is further reduced from 62 MB to 49 MB.

nodejs6/Dockerfile

@@ -5,68 +5,31 @@ LABEL io.sorna.envs.corecount="NPROC"
 # reference: https://github.com/nodejs/docker-node/blob/master/6.10/alpine/Dockerfile
 
 ENV NPM_CONFIG_LOGLEVEL info
-ENV NODE_VERSION 6.10.0
+ENV YARN_VERSION 0.21.3
 
 RUN apk add --no-cache \
-        libstdc++ \
+        libgcc libstdc++ "nodejs=6.9.2-r1" \
     && apk add --no-cache --virtual .build-deps \
-        binutils-gold \
         curl \
-        g++ \
-        gcc \
         gnupg \
-        libgcc \
-        linux-headers \
-        make \
-        python \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
-    94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
-    0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
-    FD3A5288F042B6850C66B31F09FE44734EB7990E \
-    71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
-    DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
-    B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-    56730D5401028683275BD23C23EFEFE93C4CFFFE \
-  ; do \
-    gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
-  done \
-    && curl -SLO "https://nodejs.org/dist/v$NODE_VERSION/node-v$NODE_VERSION.tar.xz" \
-    && curl -SLO "https://nodejs.org/dist/v$NODE_VERSION/SHASUMS256.txt.asc" \
-    && gpg --batch --decrypt --output SHASUMS256.txt SHASUMS256.txt.asc \
-    && grep " node-v$NODE_VERSION.tar.xz\$" SHASUMS256.txt | sha256sum -c - \
-    && tar -xf "node-v$NODE_VERSION.tar.xz" \
-    && cd "node-v$NODE_VERSION" \
-    && ./configure \
-    && make -j$(getconf _NPROCESSORS_ONLN) \
-    && make install \
-    && apk del .build-deps \
-    && cd .. \
-    && rm -Rf "node-v$NODE_VERSION" \
-    && rm "node-v$NODE_VERSION.tar.xz" SHASUMS256.txt.asc SHASUMS256.txt
-
-ENV YARN_VERSION 0.21.3
-
-RUN apk add --no-cache --virtual .build-deps-yarn curl gnupg \
-  && for key in \
-    6A010C5166006599AA17F08146C2130DFD2497F5 \
-  ; do \
-    gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
-  done \
-  && curl -fSL -o yarn.js "https://yarnpkg.com/downloads/$YARN_VERSION/yarn-legacy-$YARN_VERSION.js" \
-  && curl -fSL -o yarn.js.asc "https://yarnpkg.com/downloads/$YARN_VERSION/yarn-legacy-$YARN_VERSION.js.asc" \
-  && gpg --batch --verify yarn.js.asc yarn.js \
-  && rm yarn.js.asc \
-  && mv yarn.js /usr/local/bin/yarn \
-  && chmod +x /usr/local/bin/yarn \
-  && apk del .build-deps-yarn
+    && for key in \
+      6A010C5166006599AA17F08146C2130DFD2497F5 \
+    ; do \
+      gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
+    done \
+    && curl -fSL -o yarn.js "https://yarnpkg.com/downloads/$YARN_VERSION/yarn-legacy-$YARN_VERSION.js" \
+    && curl -fSL -o yarn.js.asc "https://yarnpkg.com/downloads/$YARN_VERSION/yarn-legacy-$YARN_VERSION.js.asc" \
+    && gpg --batch --verify yarn.js.asc yarn.js \
+    && rm yarn.js.asc \
+    && mv yarn.js /usr/local/bin/yarn \
+    && chmod +x /usr/local/bin/yarn \
+    && apk del .build-deps
 
 COPY package.json /home/sorna/package.json
 
 RUN apk add --no-cache zeromq \
     && apk add --no-cache --virtual .build-deps \
-	build-base python curl linux-headers zeromq-dev \
+        build-base python curl linux-headers zeromq-dev \
     && cd /home/sorna \
     && yarn global add node-gyp \
     && yarn install \
@@ -76,3 +39,5 @@ COPY run.js /home/sorna/run.js
 
 USER work
 CMD ["/home/sorna/jail", "default", "/usr/local/bin/node", "/home/sorna/run.js"]
+
+# vim: sts=4 sw=4 et