Set up basic CI

.drone.yml

@@ -10,11 +10,7 @@ services:
       POSTGRES_PASSWORD: postgres
 
 steps:
-  - name: lint & test
-    image: docker.io/library/elixir:1.18.3-otp-27
-    environment:
-      MIX_ENV: test
-      TEST_POSTGRES_HOST: postgres
+  - name: lint and test
     commands:
       # Install hex package manager
       - mix local.hex --force
@@ -24,20 +20,34 @@ steps:
       - mix compile --warnings-as-errors
       # Check formatting
       - mix format --check-formatted
-      # Wait for postgres to become available
-      # TODO: pg_isready is not installed in the elixir image
-      # - |
-      #   for i in {1..20}; do
-      #     pg_isready -h postgres -p $DATABASE_PORT && break
-      #     sleep 2
-      #   done
-      #   echo "Postgres did not become available, aborting"
-      #   exit 1
       # Security checks
       - mix sobelow --config
       # Check dependencies for known vulnerabilities
       - mix deps.audit
       # Check for dependencies that are not maintained anymore
       - mix hex.audit
+      # Provide hints for improving code quality
+      - mix credo
+
+  - name: postgres ready
+    image: docker.io/library/postgres:17.2
+    commands:
+      # Wait for postgres to become available
+      - |
+        for i in {1..20}; do
+          pg_isready -h postgres && break
+          sleep 2
+        done
+        echo "Postgres did not become available, aborting"
+        exit 1
+
+  - name: test
+    image: docker.io/library/elixir:1.18.3-otp-27
+    environment:
+      MIX_ENV: test
+      TEST_POSTGRES_HOST: postgres
+    depends_on:
+      - postgres ready
+    commands:
       # Run tests
       - mix test

Justfile

@@ -15,6 +15,7 @@ ci-dev: lint audit test
 lint:
     mix format --check-formatted
     mix compile --warnings-as-errors
+    mix credo
 
 audit:
     mix sobelow --config

mix.exs

@@ -67,7 +67,8 @@ defmodule Mv.MixProject do
       {:dns_cluster, "~> 0.1.1"},
       {:bandit, "~> 1.5"},
       {:mix_audit, "~> 2.1", only: [:dev, :test], runtime: false},
-      {:sobelow, "~> 0.13", only: [:dev, :test], runtime: false}
+      {:sobelow, "~> 0.13", only: [:dev, :test], runtime: false},
+      {:credo, "~> 1.7", only: [:dev, :test], runtime: false}
     ]
   end
 

mix.lock

@@ -5,7 +5,9 @@
   "ash_postgres": {:hex, :ash_postgres, "2.5.16", "9fc82621aea3c4777f9a322be8cdce10488f0eed50e7d75465285c131c30ec6b", [:mix], [{:ash, ">= 3.4.69 and < 4.0.0-0", [hex: :ash, repo: "hexpm", optional: false]}, {:ash_sql, ">= 0.2.68 and < 1.0.0-0", [hex: :ash_sql, repo: "hexpm", optional: false]}, {:ecto, ">= 3.12.1 and < 4.0.0-0", [hex: :ecto, repo: "hexpm", optional: false]}, {:ecto_sql, "~> 3.12", [hex: :ecto_sql, repo: "hexpm", optional: false]}, {:igniter, ">= 0.5.16 and < 1.0.0-0", [hex: :igniter, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:postgrex, ">= 0.0.0", [hex: :postgrex, repo: "hexpm", optional: false]}], "hexpm", "d9f328683ea861707f19e89c16c2c4f3527431c50071b2aea4bac6a822f4f448"},
   "ash_sql": {:hex, :ash_sql, "0.2.71", "40cabdd0c7af2eaa0096b2b0eae886085fed1e3b326e20434274120e11dec2c5", [:mix], [{:ash, "~> 3.5", [hex: :ash, repo: "hexpm", optional: false]}, {:ecto, "~> 3.9", [hex: :ecto, repo: "hexpm", optional: false]}, {:ecto_sql, "~> 3.9", [hex: :ecto_sql, repo: "hexpm", optional: false]}], "hexpm", "6e22da3d020aecaca9858f430828c12988c3418d252fa39be3f43fde9fd4224d"},
   "bandit": {:hex, :bandit, "1.6.8", "be6fcbe01a74e6cba42ae35f4085acaeae9b2d8d360c0908d0b9addbc2811e47", [:mix], [{:hpax, "~> 1.0", [hex: :hpax, repo: "hexpm", optional: false]}, {:plug, "~> 1.14", [hex: :plug, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}, {:thousand_island, "~> 1.0", [hex: :thousand_island, repo: "hexpm", optional: false]}, {:websock, "~> 0.5", [hex: :websock, repo: "hexpm", optional: false]}], "hexpm", "4fc08c8d4733735d175a007ecb25895e84d09292b0180a2e9f16948182c88b6e"},
+  "bunt": {:hex, :bunt, "1.0.0", "081c2c665f086849e6d57900292b3a161727ab40431219529f13c4ddcf3e7a44", [:mix], [], "hexpm", "dc5f86aa08a5f6fa6b8096f0735c4e76d54ae5c9fa2c143e5a1fc7c1cd9bb6b5"},
   "castore": {:hex, :castore, "1.0.12", "053f0e32700cbec356280c0e835df425a3be4bc1e0627b714330ad9d0f05497f", [:mix], [], "hexpm", "3dca286b2186055ba0c9449b4e95b97bf1b57b47c1f2644555879e659960c224"},
+  "credo": {:hex, :credo, "1.7.12", "9e3c20463de4b5f3f23721527fcaf16722ec815e70ff6c60b86412c695d426c1", [:mix], [{:bunt, "~> 0.2.1 or ~> 1.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:file_system, "~> 0.2 or ~> 1.0", [hex: :file_system, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "8493d45c656c5427d9c729235b99d498bd133421f3e0a683e5c1b561471291e5"},
   "db_connection": {:hex, :db_connection, "2.7.0", "b99faa9291bb09892c7da373bb82cba59aefa9b36300f6145c5f201c7adf48ec", [:mix], [{:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "dcf08f31b2701f857dfc787fbad78223d61a32204f217f15e881dd93e4bdd3ff"},
   "decimal": {:hex, :decimal, "2.3.0", "3ad6255aa77b4a3c4f818171b12d237500e63525c2fd056699967a3e7ea20f62", [:mix], [], "hexpm", "a4d66355cb29cb47c3cf30e71329e58361cfcb37c34235ef3bf1d7bf3773aeac"},
   "dns_cluster": {:hex, :dns_cluster, "0.1.3", "0bc20a2c88ed6cc494f2964075c359f8c2d00e1bf25518a6a6c7fd277c9b0c66", [:mix], [], "hexpm", "46cb7c4a1b3e52c7ad4cbe33ca5079fbde4840dedeafca2baf77996c2da1bc33"},