Lazily load the debugger gem

Some docker environments will trigger an error related to unix sockets
and permissions on temporary folders. Loading the debugger lazily
mitigates the issue so at least rails can be started without crashing,
while keeping the remote debugging available for other environments
that support it.

lib/install/Procfile.dev

@@ -1,2 +1,2 @@
-web: env RUBY_DEBUG_OPEN=true bin/rails server
+web: bin/rails server
 css: bin/rails tailwindcss:watch

lib/install/dev

@@ -8,4 +8,9 @@ fi
 # Default to port 3000 if not specified
 export PORT="${PORT:-3000}"
 
+# Let the debug gem allow remote connections,
+# but avoid loading until `debugger` is called
+export RUBY_DEBUG_OPEN="true"
+export RUBY_DEBUG_LAZY="true"
+
 exec foreman start -f Procfile.dev "$@"