Update Github Actions to node20

Also ensure CI only runs on pushes to main and tags.

.github/workflows/template-cleanup.yml

@@ -16,7 +16,9 @@ jobs:
     steps:
 
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
 
       - name: Cleanup
         run: |
@@ -49,7 +51,7 @@ jobs:
           git commit -m "Template cleanup"
 
       - name: Push changes
-        uses: ad-m/github-push-action@v0.6.0
+        uses: ad-m/github-push-action@v0.8.0
         with:
           branch: main
           github_token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/test.yml

@@ -1,26 +1,27 @@
 name: Continuous Integration
 
-on: [push, pull_request]
+on:
+  push:
+    tags: ['*']
+    branches: ['main']
+  pull_request:
 
 jobs:
   ci:
     name: ci
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Cleanup
         run: sed -i "s/%NAME%/test/g" build.sc
+      - name: Cache Scala
+        uses: coursier/cache-action@v6
       - name: Setup Scala
-        uses: olafurpg/setup-scala@v10
-        with:
-          java-version: [email protected]
-      - name: Setup Mill
-        uses: jodersky/[email protected]
+        uses: coursier/setup-action@v1
         with:
-          mill-version: 0.9.7
-      - name: Cache Scala
-        uses: coursier/cache-action@v5
+          jvm: adopt:11
+          apps: sbt mill
       - name: SBT Test
         run: sbt test
       - name: mill Test