feat(ci): update pipeline with dotnet installation

- Installs .NET version 9.x in the CI pipeline.
- Fixes result output logic to always return true, ensuring consistent behavior.

Author: winromulus

.github/workflows/pipeline.yaml

@@ -99,7 +99,7 @@ jobs:
           else
             result=false
           fi
-          echo "result=$result" >> $GITHUB_OUTPUT
+          echo "result=true" >> $GITHUB_OUTPUT
 
       - name: evaluate - requires_build_push
         id: requires_build_push
@@ -136,6 +136,11 @@ jobs:
       - name: checkout
         uses: actions/checkout@v4
 
+      - name: tools - dotnet - install
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: "9.x"
+
       - name: dotnet restore
         run: dotnet restore