Support macOS via https://github.com/erlef/otp_builds (#332)

Co-authored-by: Wojtek Mach <wojtekmach@users.noreply.github.com>

.github/workflows/action.yml

@@ -18,6 +18,8 @@ jobs:
     name: Version with commit unique id
     runs-on: ubuntu-latest
     if: github.ref == 'refs/heads/main'
+    permissions:
+      contents: write
     steps:
       - uses: actions/checkout@v4
       - name: Version it!
@@ -39,6 +41,8 @@ jobs:
     name: Expected local npm actions
     runs-on: ubuntu-latest
     if: github.ref != 'refs/heads/main'
+    permissions:
+      contents: read
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
@@ -76,3 +80,16 @@ jobs:
           node-version: '20'
       - run: npm install --production
       - run: npm test
+
+  unit_tests_macos:
+    name: Unit tests (macOS)
+    runs-on: macos-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+      - run: npm ci
+      - run: npm test