Update elixir.yml

Added Claude's improments. Uses now node20 and added node in depedencies, also added Dialyzer. Let's see....

.github/workflows/elixir.yml

@@ -1,8 +1,3 @@
-# This workflow uses actions that are not certified by GitHub.
-# They are provided by a third-party and are governed by
-# separate terms of service, privacy policy, and support
-# documentation.
-
 name: Elixir CI
 
 on:
@@ -16,9 +11,9 @@ permissions:
 
 jobs:
   build:
-
     name: Build and test
     runs-on: ubuntu-latest
+
     services:
       db:
         image: postgres:16
@@ -34,22 +29,43 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '20'
+
+    - name: Install npm dependencies
+      run: npm ci
+      working-directory: assets  # Muuta tämä tarvittaessa    
+
     - name: Set up Elixir
       uses: erlef/setup-beam@v1
       with:
-        elixir-version: '1.17.2' # [Required] Define the Elixir version
-        otp-version: '26.0'      # [Required] Define the Erlang/OTP version
-    - name: Restore depedencies cache
-      uses: actions/cache@v3
+        elixir-version: '1.17.2'
+        otp-version: '26.0'
+
+    - name: Restore dependencies cache
+      uses: actions/cache@v4  # Päivitetty v3:sta v4:ään
       with:
         path: deps
         key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
         restore-keys: ${{ runner.os }}-mix-
+
     - name: Install dependencies
       run: mix deps.get
+
+    - name: Compile dependencies
+      run: mix deps.compile
+
     - name: Run tests
       run: mix test
+
     - name: Check Formatting
       run: mix format --check-formatted
+
     - name: Run Credo
       run: mix credo --strict
+
+    - name: Run Dialyzer
+      run: mix dialyzer