Preserve gem path so that we use the same gems

Without this patch, I would end up with: ``` An error occurred in a `before(:suite)` hook. Failure/Error: raise "could not connect to gitaly at #{socket.inspect} after #{sleep_time} seconds" RuntimeError: could not connect to gitaly at "tmp/tests/gitaly/gitaly.socket" after 10 seconds ``` Digging into it, it's because `scripts/gitaly-test-spawn` could not spawn the process, because it cannot find the installed gems. I personally installed all my gems under $HOME, namely with: * `gem install rake --user-install` or: * `bundle install --path ~/.gem` The gems would be installed to `~/.gem/ruby/2.4.0/gems`, where the version is Ruby ABI version. Now we're changing $HOME, making RubyGems think that the gems would be installed to `tmp/tests/ruby/2.4.0/gems` which is apparently not the case. In order to workaround this, we could preserve $GEM_PATH populated by RubyGems, ignoring the default path based on $HOME.

Preserve gem path so that we use the same gems
873bc3a6 · Lin Jen-Shin · 888ed309 · 873bc3a6
Commit 873bc3a6 authored Dec 18, 2017 by Lin Jen-Shin
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gitaly-test-spawn scripts/gitaly-test-spawn +2 -1

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--- a/scripts/gitaly-test-spawn
+++ b/scripts/gitaly-test-spawn
 #!/usr/bin/env ruby

 gitaly_dir = 'tmp/tests/gitaly'
-env = { 'HOME' => File.expand_path('tmp/tests') }
+env = { 'HOME' => File.expand_path('tmp/tests'),
+        'GEM_PATH' => Gem.path.join(':') }
 args = %W[#{gitaly_dir}/gitaly #{gitaly_dir}/config.toml]

 # Print the PID of the spawned process