[FIXUP][.dockerignore] Ignore Gemfile.lock

NickLaMuro · NickLaMuro · commit 268839b82630 · 2020-07-15T19:02:06.000-05:00
Travis will require a `bundle install` so `rake/extensiontask` is
available when running the Rakefile, but we don't want to include this
in the `docker` build, so exclude it via the `.dockerignore`
diff --git a/.dockerignore b/.dockerignore
@@ -1 +1,2 @@
 .ruby-version
+Gemfile.lock
