workflow: Fix ownership issues

The github CI runner sets things up in weird ways that need fixing.

.github/workflows/flake-build.yml

@@ -1,4 +1,8 @@
 name: Flake build
+permissions: read-all
+concurrency:
+  cancel-in-progress: true
+  group: ${{ github.actor }}
 
 # Controls when the action will run.
 on:
@@ -19,7 +23,7 @@ jobs:
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
-    - uses: actions/checkout@f095bcc56b7c2baf48f3ac70d6d6782f4f553222
+    - uses: actions/checkout@v4
     - uses: docker://ghcr.io/fluidattacks/makes/amd64:24.02
       with:
-        args: m . /build
+        args: sh -c "chown -R root:root /github/workspace && m . /build"