Add generic platform

dockerfiles/generic/Dockerfile

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+# using ubuntu as distro which has a better set of defaults and packages
+# using 20:04 as it's latest at the moment (June 2020)
+# not using latest explicitly to make it future proof
+FROM ubuntu:20.04
+
+# Install locales and set UTF-8 as default locale to avoid common pitfails
+# Install build-essential and openssl-dev as a minimum set of shared libs and headers
+# This is effectively required to build and link any other language executable
+
+RUN apt-get update && apt-get install -y locales \
+    build-essential openssl libssl-dev ca-certificates \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/* \
+    && localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8
+ENV LANG en_US.utf8
+
+WORKDIR /source
+
+COPY ./prepare_build.sh .
+RUN /bin/bash /source/prepare_build.sh
+
+COPY . .
+
+# build.sh might generate `run.sh`
+RUN /bin/bash /source/build.sh
+
+# Use /bin/bash to avoid issues with +x
+ENTRYPOINT ["/bin/bash", "/source/run.sh"]

dockerfiles/generic/README.md

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+# Customizable platform based on ubuntu:latest
+
+## How to use generic platform:
+
+1. Place your dependencies in `prepare_buld.sh` (you can skip it)
+2. Place you build logic into `build.sh` (you can skip it)
+3. Launch your code in `run.sh` (code will be located at `/source/`)
+
+
+## Build algorithm:
+
+* a single file `./prepare_buld.sh` copied under `container:/source/prepare_buld.sh`
+* `/source/prepare_buld.sh` is launched before the build step to setup dependencies and caches
+* all code from the repository is placed under `container:/source/` folder
+* `/source/buld.sh` will be called at the build step
+* `/source/run.sh` will be called as an entry point for your solution
+
+### Notes:
+
+* `/source/run.sh` might be generated or modified by `build.sh`
+* `prepare_buld.sh` must not depend on any other file in the repository
+* `prepare_buld.sh` should be used for installing packages and getting extra dependencies, it should not change too frequently and required to make builds faster

dockerfiles/generic/build.sh

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+#!/bin/bash
+
+set -e # do not proceed if we failed somewhere
+
+# Replace contents with anything you need to do on the build step
+# Here you can access internet and install additional packages with apt-get install
+# You can also compile you application and place all the needed data where you expect it
+
+# Note: if you install packages with apt-get don't forget to run 
+# apt-get clean && rm -rf /var/lib/apt/lists/*
+# or you might end up in weird caching issues
+
+
+mkdir -p /data
+echo "Hello, World!" > /data/greeting.txt
+

dockerfiles/generic/prepare_build.sh

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+#!/bin/bash
+
+set -e # do not proceed if we failed somewhere
+
+# Replace contents with anything you need to do BEFORE the build step
+# This is the best place to download any external dependency and install additional packages
+
+# Note: if you install packages with apt-get don't forget to run
+# `apt-get clean && rm -rf /var/lib/apt/lists/*`
+# or you might end up in weird caching issues
+
+# Note: this must be a self-contained file and should not depent on any other file in your repo
+
+# Note: all the same can be done in build.sh, this file purely exists to speed-up build times
+#       and help orgamizer's team with possible cache issues
+#       Please be kind and move as much as possible here (and don't change it too often)
+
+
+# Uncomment the following line and put some packages there
+# apt-get install <something>
+
+apt-get clean && rm -rf /var/lib/apt/lists/*

dockerfiles/generic/run.sh

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+#!/bin/bash
+
+# Just replace contents with
+# exec $your_binary $your_extra_flags "$@"
+
+exec /bin/echo `cat /data/greeting.txt` and "$@"