Move format to last since it takes time

We want to fail ultimately, but this makes it possible to have a format error and still ensure build/test/pack/push work, even test the produced package via the CI feed, and leave the format fixing for later, instead of it blocking any progress up front.

.github/workflows/build.yml

@@ -30,9 +30,6 @@ jobs:
           submodules: recursive
           fetch-depth: 0
 
-      - name: ✓ ensure format
-        run: dotnet format --verify-no-changes -v:diag --exclude ~/.nuget
-
       - name: ⚙ msbuild
         uses: microsoft/setup-msbuild@v1.1
 
@@ -71,6 +68,9 @@ jobs:
           dotnet tool install -g --version 4.0.18 sleet 
           sleet push bin --config none -f --verbose -p "SLEET_FEED_CONTAINER=nuget" -p "SLEET_FEED_CONNECTIONSTRING=${{ secrets.SLEET_CONNECTION }}" -p "SLEET_FEED_TYPE=azure" || echo "No packages found"
 
+      - name: ✓ ensure format
+        run: dotnet format --verify-no-changes -v:diag --exclude ~/.nuget
+
       # Only push CI package to nuget.org for releases
       - name: 🚀 nuget
         if: github.event_name == 'release'