Use checkFormatAll

Author: Baccata

.github/workflows/ci.yml

@@ -39,7 +39,7 @@ jobs:
     - name: Run tests
       run: |
         mill -k --disable-ticker __.resolvedIvyDeps &&
-        mill -j 0 -k --disable-ticker __.checkFormat &&
+        mill -k --disable-ticker mill.scalalib.scalafmt.ScalafmtModule/checkFormatAll __.sources &&
         mill -j 0 -k --disable-ticker __.test
 
     - name: Set up GPG