chore: split Elixir tasks

Split CI tasks related to Elixir to improve build times by parallelizing
different steps.

.github/workflows/elixir.yml

@@ -0,0 +1,162 @@
+name: Elixir tests
+on:
+  pull_request:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  SECRET_KEY_BASE: ${{ secrets.SECRET_KEY_BASE }}
+
+jobs:
+  deps:
+    name: Fetch deps
+    runs-on: u22-arm-runner
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          otp-version: '25.3.2.7'
+          elixir-version: '1.17'
+      - name: Cache Mix
+        uses: actions/cache@v3
+        with:
+          path: deps
+          key: ${{ runner.os }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+          restore-keys: |
+            ${{ runner.os }}-mix-
+      - name: Install dependencies
+        run: |
+          mix local.hex --force
+          mix local.rebar --force
+          mix deps.get
+
+  format:
+    name: Formatting checks
+    runs-on: u22-arm-runner
+    needs: [deps]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          otp-version: '25.3.2.7'
+          elixir-version: '1.17'
+      - name: Cache Mix
+        uses: actions/cache@v3
+        with:
+          path: deps
+          key: ${{ runner.os }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+          restore-keys: |
+            ${{ runner.os }}-mix-
+      - name: Run format check
+        run: mix format --check-formatted
+
+  credo:
+    name: Code style
+    runs-on: u22-arm-runner
+    needs: [deps]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          otp-version: '25.3.2.7'
+          elixir-version: '1.17'
+      - name: Cache Mix
+        uses: actions/cache@v3
+        with:
+          path: deps
+          key: ${{ runner.os }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+          restore-keys: |
+            ${{ runner.os }}-mix-
+      - run: mix deps.compile credo --include-children
+      - name: Credo checks
+        run: mix credo --strict --mute-exit-status
+
+  tests:
+    name: Run tests
+    runs-on: u22-arm-runner
+    needs: [deps]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          otp-version: '25.3.2.7'
+          elixir-version: '1.17'
+      - name: Cache Mix
+        uses: actions/cache@v3
+        with:
+          path: deps
+          key: ${{ runner.os }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+          restore-keys: |
+            ${{ runner.os }}-mix-
+      - name: Cache Build
+        uses: actions/cache@v3
+        with:
+          path: _build
+          key: ${{ runner.os }}-build-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+          restore-keys: |
+            ${{ runner.os }}-build-
+      - name: Set up Rust
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: stable
+      - name: Compile
+        env:
+          MIX_ENV: test
+        run: mix compile
+      - name: Set up Postgres
+        run: docker-compose -f ./docker-compose.db.yml up -d
+      - name: Run main database migrations
+        run: mix ecto.migrate --prefix _supavisor --log-migrator-sql
+      - name: Start epmd
+        run: epmd -daemon
+      - name: Run tests
+        run: mix test
+
+  dialyzer:
+    name: Dialyze
+    runs-on: u22-arm-runner
+    needs: [deps]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          otp-version: '25.3.2.7'
+          elixir-version: '1.17'
+      - name: Cache Mix
+        uses: actions/cache@v3
+        with:
+          path: deps
+          key: ${{ runner.os }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+          restore-keys: |
+            ${{ runner.os }}-mix-
+      - name: Set up Rust
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: stable
+      - name: Retrieve PLT Cache
+        uses: actions/cache@v3
+        id: plt-cache
+        with:
+          path: priv/plts
+          key: ${{ runner.os }}-${{ steps.beam.outputs.otp-version }}-${{ steps.beam.outputs.elixir-version }}-plts-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+      - name: Create PLTs
+        if: steps.plt-cache.outputs.cache-hit != 'true'
+        run: |
+          mkdir -p priv/plts
+          mix dialyzer.build
+      - name: Run dialyzer
+        run: mix dialyzer

mix.exs

@@ -50,7 +50,7 @@ defmodule Supavisor.MixProject do
       {:joken, "~> 2.5.0"},
       {:cloak_ecto, "~> 1.2.0"},
       {:meck, "~> 0.9.2", only: :test},
-      {:credo, "~> 1.6.4", only: [:dev, :test], runtime: false},
+      {:credo, "~> 1.6", only: [:dev, :test], runtime: false},
       {:dialyxir, "~> 1.1.0", only: [:dev], runtime: false},
       {:benchee, "~> 1.1.0", only: :dev},
       {:prom_ex, "~> 1.8.0"},