update GitHub Actions workflow for Elm deployment; streamline steps a…

…nd enhance permissions for GitHub Pages

.github/workflows/elm.yml

@@ -1,29 +1,39 @@
-# This is a basic workflow to help you get started with Actions
+# Workflow for compiling elm and deploying static content to GitHub Pages
+name: Deploy static content to Pages
 
-name: CI
-
-# Controls when the workflow will run
 on:
-  # Triggers the workflow on push or pull request events but only for the "main" branch
+  # Runs on pushes targeting the default branch
   push:
     branches: ["main"]
-  pull_request:
-    branches: ["main"]
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
-# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
 jobs:
-  # This workflow contains a single job called "build"
-  build:
-    # The type of runner that the job will run on
+  # Single deploy job since we're just deploying
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
-
-    # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v4
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
 
       - name: Setup Elm
         uses: jorelali/setup-elm@v1
@@ -35,9 +45,6 @@ jobs:
 
       - name: Compile to JS
         run: make -C frontend/
-
-      - name: Setup Pages
-        uses: actions/configure-pages@v5
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with: