build(CI/CD): Added elixir_ci.yml 'Build and test' job for Github Act…

…ions

.github/workflows/elixir_ci.yml

@@ -0,0 +1,73 @@
+# book_my_gigs_test/.github/workflows/elixir_ci.yml
+name: Elixir CI
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+
+env:
+  MIX_ENV: test
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Build and test
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        elixir: [1.15.2]
+        otp: [22.2.8]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Elixir
+        uses: erlef/setup-beam@61e01a43a562a89bfc54c7f9a378ff67b03e4a21
+        with:
+          elixir-version: ${{ matrix.elixir }}
+          otp-version: ${{ matrix.otp }}
+
+      - name: Retrieve mix dependencies
+        uses: actions/cache@v3
+        id: mix-cache
+        with:
+          path: deps
+          key: ${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+          restore-keys: ${{ runner.os }}-mix-
+
+      - name: Install mix dependencies
+        if: steps.mix-cache.outputs.cache-hit != 'true'
+        run: |
+          mix local.rebar --force
+          mix local.hex --force
+          mix deps.get
+
+      - name: Check formatting
+        run: mix format --check-formatted
+
+      - name: Run Credo
+        run: mix credo
+
+      - name: Retrieve PLT Cache
+        uses: actions/cache@v3
+        id: plt-cache
+        with:
+          path: priv/plts
+          key: ${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-plts-$${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock'))}}
+
+      - name: Create PLTs
+        if: steps.plt-cache.outputs.cache-hit != 'true'
+        run: |
+          mkdir -p prv/plts
+          mix dialyzer --plt
+
+      - name: Run Dialyzer
+        run: mix dialyzer --no-check --halt-exit-status
+
+      - name: Run tests
+        run: mix test

mix.exs

@@ -17,7 +17,8 @@ defmodule BookMyGigs.MixProject do
         "coveralls.post": :test,
         "coveralls.html": :test,
         "coveralls.cobertura": :test
-      ]
+      ],
+      dialyzer: dialyzer()
     ]
   end
 
@@ -94,4 +95,11 @@ defmodule BookMyGigs.MixProject do
       ]
     ]
   end
+
+  defp dialyzer do
+    [
+      plt_core_path: "priv/plts",
+      plt_file: {:no_warn, "priv/plts/dialyzer.plt"}
+    ]
+  end
 end