chore: fix ci

Author: taciturnaxolotl

.github/workflows/ci.yml

@@ -1,34 +1,35 @@
 name: Code Quality
 
 on:
-  push:
-    branches: [ main, develop ]
-  pull_request:
-    branches: [ main ]
+    push:
+        branches: [main, develop]
+    pull_request:
+        branches: [main]
 
 jobs:
-  format-check:
-    runs-on: ubuntu-latest
-    
-    steps:
-    - uses: actions/checkout@v4
-    
-    - name: Set up JDK 17
-      uses: actions/setup-java@v4
-      with:
-        java-version: '17'
-        distribution: 'temurin'
-    
-    - name: Setup Mill
-      uses: jodersky/setup-mill@v0.2.3
-      with:
-        mill-version: 0.12.11
-    
-    - name: Check Java formatting
-      run: mill checkJavaFormat
-    
-    - name: Compile code
-      run: mill compile
-    
-    - name: Run tests
-      run: mill test
+    format-check:
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/checkout@v4
+
+            - name: Set up JDK 17
+              uses: actions/setup-java@v4
+              with:
+                  java-version: "17"
+                  distribution: "temurin"
+
+            - uses: zhutmost/setup-mill@main
+              with:
+                  mill-version: 0.12.11
+
+            - name: Check Java formatting
+              run: mill checkJavaFormat
+              # the server process is kept alive across steps,
+              # so separate invocations of mill remain extremely fast!
+
+            - name: Compile
+              run: mill compile
+
+            - name: Test
+              run: mill test