Use an absolute path for the global composer bin dir

Expected Behavior

When running a binary through Symfony\Component\Process\ExecutableFinder it should be able to find the binary automatically.

Current Behavior

When using grumphp which relies on Symfony\Component\Process\ExecutableFinder the path that refers to $HOME with ~ does not work:

docker-images-php/utils/Dockerfile.slim.blueprint

Line 253 in 4207a2f

ENV PATH="$PATH:./vendor/bin:~/.composer/vendor/bin"

Possible Solution

You could make an argument that Symfony should be able to locate this better. But I think that modifying the PATH variable to include the absolute path for the composer binary is the easiest fix.

Steps to Reproduce (for bugs)

# Require package globally.
composer global require phpro/grumphp
# Try initializing the grumphp git hooks.
grumphp git:init
# Set an absolute path for composer binary.
export PATH=$PATH:/home/docker/.composer/vendor/bin
# Re run the initialization of grumphp git hooks.
grumphp git:init

Context

Trying to implement coding standards with the phpro/grumphp package installed globally.

Your Environment

Not relevant.

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