Add readme

README.md

+# Conan docker tools for Soleil
+
+Based on https://github.com/conan-io/conan-docker-tools to build Docker images for Soleil environments
+
+All images include:
+- Conan 1.53.0 with Python 3.6.13
+- Cmake 3.24.2
+- Git 2.36.2
+
+| Image               | OS             | Arch    | GCC                                         |
+| ------------------- | -------------- | ------- | --------------------------------------------|
+| conan-el6-gcc44     | CentOS 6       | x86_64  | gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23) |
+| conan-el6-gcc44-x86 | CentOS 6       | i686    | gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23) |
+| conan-el6-gcc73     | CentOS 6       | x86_64  | gcc (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5)  |
+| conan-el6-gcc73-x86 | CentOS 6       | i686    | gcc (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5)  |
+| conan-el6-gcc83     | CentOS 6       | x86_64  | gcc (GCC) 8.3.1 20190311 (Red Hat 8.3.1-3)  |
+| conan-el6-gcc83-x86 | CentOS 6       | i686    | gcc (GCC) 8.3.1 20190311 (Red Hat 8.3.1-3)  |
+| conan-el6-gcc91     | CentOS 6       | x86_64  | gcc (GCC) 9.1.1 20190605 (Red Hat 9.1.1-2)  |
+| conan-el6-gcc91-x86 | CentOS 6       | i686    | gcc (GCC) 9.1.1 20190605 (Red Hat 9.1.1-2)  |
+| conan-el7-gcc44     | CentOS 7       | x86_64  | gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44) |
+| conan-el7-gcc44-x86 | CentOS 7       | i686    | gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44) |
+| conan-el7-gcc73     | CentOS 7       | x86_64  | gcc (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5)  |
+| conan-el7-gcc73-x86 | CentOS 7       | i686    | gcc (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5)  |
+| conan-el7-gcc83     | CentOS 7       | x86_64  | gcc (GCC) 8.3.1 20190311 (Red Hat 8.3.1-3)  |
+| conan-el7-gcc82-x86 | CentOS 7       | i686    | gcc (GCC) 8.2.1 20180905 (Red Hat 8.2.1-3)  |
+| conan-el7-gcc93     | CentOS 7       | x86_64  | gcc (GCC) 9.3.1 20200408 (Red Hat 9.3.1-2)  |
+| conan-el7-gcc93-x86 | CentOS 7       | i686    | gcc (GCC) 9.3.1 20200408 (Red Hat 9.3.1-2)  |
+
+## Build 
+
+### To build one image
+
+```
+docker-compose build conan-el6-gcc44
+```
+
+### To build all images
+
+```
+$ docker-compose build
+```
+
+### To build an image manually without docker-compose
+
+```
+docker build --build-arg http_proxy --build-arg https_proxy --build-arg no_proxy -t conan-el6-gcc44 -f conan-el6-gcc44/Dockerfile .
+```
+
+### To build image without docker-compose with specific version of Conan
+
+```
+$ docker build --build-arg http_proxy --build-arg https_proxy --build-arg no_proxy --build-arg CONAN_VERSION=1.53.0 -t conan-el6-gcc44 -f conan-el6-gcc44/Dockerfile .
+```
+
+## Launch
+
+### To launch one with docker-compose
+```
+$ docker-compose run --rm conan-el6-gcc44
+```
+
+### To launch one x86 with docker-compose
+```
+$ docker-compose run --rm conan-el6-gcc44-x86
+```
+
+### To launch one container without docker-compose
+
+```
+$ docker run --rm -ti -e http_proxy -e https_proxy -e no_proxy conan-el6-gcc44
+```
+
+### To launch one container x86 without docker-compose
+
+```
+$ docker run --rm -ti -e http_proxy -e https_proxy -e no_proxy --platform=linux/386 conan-el6-gcc44-x86
+```
+
+### To launch containers in detached mode with docker-compose
+
+To launch all containers
+```
+$ docker-compose up -d
+```
+
+To launch one containers
+```
+$ docker-compose up -d conan-el6-gcc44
+```
+
+To connect into a container
+```
+$ docker exec -it conan-el6-gcc44 bash
+```
+
+To connect into a container x86
+```
+$ docker exec -it conan-el6-gcc44-x86 linux32 bash
+```
+
+## Known issues
+
+### BuildKit 
+When you build an image that depends of other, you can be unable to get dependency if buildKit is enable
+```
+ => ERROR [internal] load metadata for docker.io/library/conan-el6-gcc44-x86:latest                                                                                                                          1.5s
+------
+ > [internal] load metadata for docker.io/library/conan-el6-gcc44-x86:latest:
+------
+failed to solve: rpc error: code = Unknown desc = failed to solve with frontend dockerfile.v0: failed to create LLB definition: pull access denied, repository does not exist or may require authorization: server message: insufficient_scope: authorization failed
+```
+
+To fix it
+```
+export DOCKER_BUILDKIT=0
+```
+
+### CentOS 6 on WSL2
+There is an issue when old Linux distribution as CentOS 6 with Docker on Windows with WSL2
+
+The exit with return code 139
+https://github.com/microsoft/WSL/issues/4694#issuecomment-556095344
+
+Create a file %USERPROFILE%/.wslconfig with Unix end lines (LF)
+```
+[wsl2]
+kernelCommandLine = vsyscall=emulate
+```
+
+For testing
+
+```
+$ docker run -ti centos:6 bash
+```
+