Easy access to composer/composer docker image

Easy access to composer docker image

# This shell script can be used for easier accessing the composer/composer docker image (https://hub.docker.com/r/composer/composer/)

Create new composer file
```sh
sudo vim /usr/local/bin/composer
```

The contents of the file will look like this:

```sh
#!/bin/sh
export PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin
echo "Current working directory: '"$(pwd)"'"
docker run --rm -v $(pwd):/app -v ~/.ssh:/root/.ssh composer/composer $@
```

Once the script has been made, it must be set as executable

```sh
sudo chmod +x /usr/local/bin/composer
```

Now the `composer` command is available native on host:

```sh
composer --version
```