Update CI config to latest elixir/erlang

Author: ConnorRigby

.circleci/config.yml

@@ -1,12 +1,9 @@
 version: 2
 
-install_elixir: &install_elixir
-  run:
-    name: Install Elixir
-    command: |
-      wget https://repo.hex.pm/builds/elixir/v$ELIXIR_VERSION.zip
-      unzip -d /usr/local/elixir v$ELIXIR_VERSION.zip
-      echo 'export PATH=/usr/local/elixir/bin:$PATH' >> $BASH_ENV
+defaults: &defaults
+  working_directory: ~/repo
+  environment:
+    LC_ALL: C.UTF-8
 
 install_hex_rebar: &install_hex_rebar
   run:
@@ -19,101 +16,80 @@ install_system_deps: &install_system_deps
   run:
     name: Install system dependencies
     command: |
-      apt update
-      apt install -y unzip libmnl-dev libnl-genl-3-dev
-
-defaults: &defaults
-  working_directory: ~/repo
+        apk add build-base linux-headers libmnl-dev libnl3-dev git
 
 jobs:
-  build_elixir_1_10_otp_23:
+  build_elixir_1_11_otp_23:
     docker:
-      - image: erlang:23.0.3
-        environment:
-          ELIXIR_VERSION: 1.10.4-otp-23
-          LC_ALL: C.UTF-8
+      - image: hexpm/elixir:1.11.4-erlang-23.3-alpine-3.13.2
     <<: *defaults
     steps:
       - checkout
-      - <<: *install_system_deps
-      - <<: *install_elixir
       - <<: *install_hex_rebar
+      - <<: *install_system_deps
       - restore_cache:
           keys:
             - v1-mix-cache-{{ checksum "mix.lock" }}
       - run: mix deps.get
-      - run: mix coveralls.circle
+      - run: mix test
       - run: mix format --check-formatted
+      - run: mix deps.unlock --check-unused
+      - run: mix compile --warnings-as-errors
       - run: mix docs
       - run: mix hex.build
       - run: mix credo -a
       - run: mix dialyzer
+      - run: mix coveralls.circle || true
       - save_cache:
           key: v1-mix-cache-{{ checksum "mix.lock" }}
           paths:
             - _build
             - deps
 
-  build_elixir_1_10_otp_22:
+  build_elixir_1_10_otp_23:
     docker:
-      - image: erlang:22.3.4.1
-        environment:
-          ELIXIR_VERSION: 1.10.3-otp-22
-          LC_ALL: C.UTF-8
+      - image: hexpm/elixir:1.10.4-erlang-23.3-alpine-3.13.2
     <<: *defaults
     steps:
       - checkout
-      - <<: *install_system_deps
-      - <<: *install_elixir
       - <<: *install_hex_rebar
+      - <<: *install_system_deps
       - run: mix deps.get
       - run: mix compile
       - run: mix test
 
   build_elixir_1_9_otp_22:
     docker:
-      - image: erlang:22.2
-        environment:
-          ELIXIR_VERSION: 1.9.4-otp-22
-          LC_ALL: C.UTF-8
+      - image: hexpm/elixir:1.9.4-erlang-22.3.4.9-alpine-3.13.1
     <<: *defaults
     steps:
       - checkout
-      - <<: *install_system_deps
-      - <<: *install_elixir
       - <<: *install_hex_rebar
+      - <<: *install_system_deps
       - run: mix deps.get
       - run: mix compile
       - run: mix test
 
   build_elixir_1_8_otp_22:
     docker:
-      - image: erlang:22.0
-        environment:
-          ELIXIR_VERSION: 1.8.2-otp-22
-          LC_ALL: C.UTF-8
+      - image: hexpm/elixir:1.8.2-erlang-22.3.4.9-alpine-3.13.1
     <<: *defaults
     steps:
       - checkout
-      - <<: *install_system_deps
-      - <<: *install_elixir
       - <<: *install_hex_rebar
+      - <<: *install_system_deps
       - run: mix deps.get
       - run: mix compile
       - run: mix test
 
   build_elixir_1_7_otp_21:
     docker:
-      - image: erlang:21.3
-        environment:
-          ELIXIR_VERSION: 1.7.4-otp-21
-          LC_ALL: C.UTF-8
+      - image: hexpm/elixir:1.7.4-erlang-21.3.8.15-alpine-3.12.0
     <<: *defaults
     steps:
       - checkout
-      - <<: *install_system_deps
-      - <<: *install_elixir
       - <<: *install_hex_rebar
+      - <<: *install_system_deps
       - run: mix deps.get
       - run: mix compile
       - run: mix test
@@ -122,8 +98,8 @@ workflows:
   version: 2
   build_test:
     jobs:
+      - build_elixir_1_11_otp_23
       - build_elixir_1_10_otp_23
-      - build_elixir_1_10_otp_22
       - build_elixir_1_9_otp_22
       - build_elixir_1_8_otp_22
       - build_elixir_1_7_otp_21

mix.lock

@@ -3,7 +3,6 @@
   "certifi": {:hex, :certifi, "2.6.1", "dbab8e5e155a0763eea978c913ca280a6b544bfa115633fa20249c3d396d9493", [:rebar3], [], "hexpm", "524c97b4991b3849dd5c17a631223896272c6b0af446778ba4675a1dff53bb7e"},
   "credo": {:hex, :credo, "1.5.5", "e8f422026f553bc3bebb81c8e8bf1932f498ca03339856c7fec63d3faac8424b", [:mix], [{:bunt, "~> 0.2.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:file_system, "~> 0.2.8", [hex: :file_system, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "dd8623ab7091956a855dc9f3062486add9c52d310dfd62748779c4315d8247de"},
   "dialyxir": {:hex, :dialyxir, "1.1.0", "c5aab0d6e71e5522e77beff7ba9e08f8e02bad90dfbeffae60eaf0cb47e29488", [:mix], [{:erlex, ">= 0.2.6", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "07ea8e49c45f15264ebe6d5b93799d4dd56a44036cf42d0ad9c960bc266c0b9a"},
-  "earmark": {:hex, :earmark, "1.4.4", "4821b8d05cda507189d51f2caeef370cf1e18ca5d7dfb7d31e9cafe6688106a4", [:mix], [], "hexpm", "1f93aba7340574847c0f609da787f0d79efcab51b044bb6e242cae5aca9d264d"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.12", "b245e875ec0a311a342320da0551da407d9d2b65d98f7a9597ae078615af3449", [:mix], [], "hexpm", "711e2cc4d64abb7d566d43f54b78f7dc129308a63bc103fbd88550d2174b3160"},
   "elixir_make": {:hex, :elixir_make, "0.6.2", "7dffacd77dec4c37b39af867cedaabb0b59f6a871f89722c25b28fcd4bd70530", [:mix], [], "hexpm", "03e49eadda22526a7e5279d53321d1cced6552f344ba4e03e619063de75348d9"},
   "erlex": {:hex, :erlex, "0.2.6", "c7987d15e899c7a2f34f5420d2a2ea0d659682c06ac607572df55a43753aa12e", [:mix], [], "hexpm", "2ed2e25711feb44d52b17d2780eabf998452f6efda104877a3881c2f8c0c0c75"},