GitHubCI: check XAML style before install NET6

This way we save some CI time in case the XAML check fails.

.github/workflows/CI.yml

@@ -13,7 +13,7 @@ jobs:
     - uses: actions/checkout@v1
       with:
         submodules: false
-    - name: Install dependencies
+    - name: Install prettier&commitlint dependencies
       run: |
         apt update
         apt install --yes sudo
@@ -22,6 +22,12 @@ jobs:
     - name: ownership workaround
       run: git config --global --add safe.directory '*'
 
+    - name: Check XAML style with prettier
+      run: |
+        sudo npm install --save-dev prettier @prettier/plugin-xml
+        ./node_modules/.bin/prettier --xml-whitespace-sensitivity ignore --tab-width 4 --prose-wrap preserve --write '**/*.xaml'
+        git diff --exit-code
+
     - name: Install .NET6
       run: |
         apt update && apt install --yes sudo
@@ -36,11 +42,6 @@ jobs:
       run: |
         dotnet format whitespace ./src --folder
         git diff --exit-code
-    - name: Check XAML style with prettier
-      run: |
-        sudo npm install --save-dev prettier @prettier/plugin-xml
-        ./node_modules/.bin/prettier --xml-whitespace-sensitivity ignore --tab-width 4 --prose-wrap preserve --write '**/*.xaml'
-        git diff --exit-code
     - name: Check if gitPush1by1 was used
       if: github.event_name == 'pull_request'
       run: |