Use ubuntu 16.04

vtm9 · vtm9 · commit 07587a5c517d · 2021-09-11T21:35:38.000+03:00
diff --git a/.github/workflows/master.yml b/.github/workflows/master.yml
@@ -7,7 +7,7 @@ on:
 jobs:
   build:
     if: github.repository == 'hexlet-codebattle/codebattle'
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-16.04
 
     services:
       db:
diff --git a/services/app/Dockerfile.dev b/services/app/Dockerfile.dev
@@ -1,4 +1,4 @@
-FROM elixir:1.12.3
+FROM elixir:1.12.3-slim
 
 RUN mix local.hex --force \
   && mix local.rebar --force
