Add .dockerignore

.dockerignore

@@ -0,0 +1,19 @@
+_build
+CONTRIBUTING.md
+deps
+docker-compose.yml
+Dockerfile
+.elixir_ls
+.formatter.exs
+.git
+.gitignore
+.gitlab
+.gitlab-ci.yml
+.graphqlconfig.yaml
+LICENSE
+Makefile
+README.md
+SECURITY.md
+ssh_match_hostname
+support
+.js/package-lock.json