Keep the build images DRY

Dockerfile.custom

@@ -0,0 +1,49 @@
+#
+# The arguments in this file are configured in
+# /scripts/custom-docker-build
+#
+
+ARG CUSTOM_IMAGE_NAME
+ARG CUSTOM_IMAGE_VERSION
+FROM ${CUSTOM_IMAGE_NAME}:${CUSTOM_IMAGE_VERSION}
+
+ADD / /
+
+RUN /scripts/install-essentials
+
+ENV PATH $PATH:/usr/local/go/bin
+
+# Git
+ARG GIT_VERSION
+ARG GIT_DOWNLOAD_URL=https://www.kernel.org/pub/software/scm/git/git-${GIT_VERSION}.tar.gz
+ARG GIT_DOWNLOAD_SHA256
+RUN if [ -n "$GIT_VERSION" ]; then /scripts/install-git && git --version; fi
+
+# Chrome
+ARG CHROME_VERSION
+RUN if [ -n "$CHROME_VERSION" ]; then /scripts/install-chrome $CHROME_VERSION; fi
+
+# PhantomJS
+ARG PHANTOMJS_VERSION
+RUN if [ -n "$PHANTOMJS_VERSION" ] ; then /scripts/install-phantomjs $PHANTOMJS_VERSION; fi
+
+# NodeJS
+ARG NODE_VERSION
+RUN if [ -n "$NODE_VERSION" ] ; then /scripts/install-node $NODE_VERSION && node --version; fi
+
+# Golang
+ARG GOLANG_VERSION
+ARG GOLANG_DOWNLOAD_SHA256
+RUN if [ -n "$GOLANG_VERSION" ] ; then /scripts/install-golang && go version; fi
+
+# Postgres
+# Codedebt: currently this will only install the default version of postgres,
+# not the stipulated version
+ARG POSTGRES_VERSION
+RUN if [ -n "$POSTGRES_VERSION" ] ; then /scripts/install-postgresql; fi
+
+
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8