ci: add Elixir v1.16 to legacy jobs

Author: joeljuca

.github/workflows/legacy.yml

@@ -4,6 +4,39 @@ on:
   push:
 
 jobs:
+  v1dot16:
+    runs-on: ubuntu-22.04
+    name: elixir-${{ matrix.elixir }}-otp-${{ matrix.otp }}
+    strategy:
+      matrix:
+        otp: ["25", "26", "27", "28"]
+        elixir: ["1.16"]
+    services:
+      postgres:
+        image: postgres:16.1-alpine3.19
+        ports:
+          - 5432:5432
+        env:
+          POSTGRES_PASSWORD: postgres
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+    steps:
+      - uses: actions/checkout@v3
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: ${{ matrix.otp }}
+          elixir-version: ${{ matrix.elixir }}
+      - uses: actions/cache@v3
+        with:
+          path: deps
+          key: deps_${{ runner.os }}_${{ matrix.otp }}_${{ matrix.elixir }}_${{ hashFiles('mix.lock') }}
+
+      - run: MIX_ENV=test mix do deps.get + deps.compile + compile
+      - run: mix test
+
   v1dot15:
     runs-on: ubuntu-22.04
     name: elixir-${{ matrix.elixir }}-otp-${{ matrix.otp }}