Remove OSTYPE check and update README file (#408)

Remove OSTYPE check in Dockerfile since it is not
necessary. Its value is empty when image is being built.

Cleaned up commands in README file.

README.md

@@ -48,11 +48,11 @@ Installation
 
   * Establish an SSH tunnel to the replicas (only necessary on local environments)
 ```bash
-$ ./php bin/console toolforge:ssh
+$ ./bin/console toolforge:ssh
 ```
   * Bind address for docker enviroments
 ```bash
-$ php bin/console toolforge:ssh --bind-address=0.0.0.0
+$ ./bin/console toolforge:ssh --bind-address=0.0.0.0
 ```
 
 ## CLI Usage
@@ -101,7 +101,7 @@ Run `composer install` to install dependencies required for testing.
 
 Make sure the test database is created and migrations are up-to-date:
 ```bash
-$ ./bin/console doctrine:migrations:database:create --env=test
+$ ./bin/console doctrine:database:create --env=test
 $ ./bin/console doctrine:migrations:migrate --env=test --no-interaction
 ```
 

docker/Dockerfile

@@ -10,7 +10,7 @@ EXPOSE 8080
 # work around https://github.com/docker-library/openjdk/blob/0584b2804ed12dca7c5e264b5fc55fc07a3ac148/8-jre/slim/Dockerfile#L51-L54
 RUN mkdir -p /usr/share/man/man1
 
-RUN if [[ "$OSTYPE" == "linux-gnu"* ]]; then addgroup --gid $GROUP_ID docker; fi
+RUN addgroup --gid $GROUP_ID docker
 RUN adduser --disabled-password --gecos '' --uid $USER_ID --gid $GROUP_ID docker 
 
 RUN apt-get update -q && apt-get install -y \