Clean things up before starting the build

In case the queue never is empty we'll never clean things up.. so do this at the start
We now only download the files that are actually needed, so it's not that important anymore when we clean things up.

.github/workflows/build.yml

@@ -44,6 +44,13 @@ jobs:
         If ($skipBuild) {echo '::set-output name=skip-build::true'}
         exit 0
 
+    - name: Clean up assets
+      if: steps.check.outputs.skip-build != 'true'
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: |
+        python autobuild.py clean-assets
+
     - name: Show build queue
       if: steps.check.outputs.skip-build != 'true'
       env:
@@ -80,10 +87,3 @@ jobs:
         $MSYS2_ROOT=(msys2 -c 'cygpath -w /')
         Get-PSDrive -PSProvider FileSystem
         python autobuild.py build "$MSYS2_ROOT" "$BUILD_ROOT"
-
-    - name: Clean up assets
-      if: steps.check.outputs.skip-build != 'true'
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      run: |
-        python autobuild.py clean-assets