put app root in $HOME

lib/foreman/engine.rb

@@ -256,7 +256,10 @@ private
       1.upto(formation[@names[process]]) do |n|
         reader, writer = create_pipe
         begin
-          pid = process.run(:output => writer, :env => { "PORT" => port_for(process, n).to_s })
+          pid = process.run(:output => writer, :env => {
+            "HOME" => process.cwd,
+            "PORT" => port_for(process, n).to_s
+          })
           writer.puts "started with pid #{pid}"
         rescue Errno::ENOENT
           writer.puts "unknown command: #{process.command}"

lib/foreman/process.rb

@@ -90,8 +90,10 @@ class Foreman::Process
     !alive?
   end
 
-private
-
+  # Returns the working directory for this +Process+
+  #
+  # @returns [String]
+  #
   def cwd
     File.expand_path(@options[:cwd] || ".")
   end