[CONAN] use dummy jobs

.github/workflows/nix-ga.yml

@@ -26,7 +26,7 @@ jobs:
             exit 0
           fi
 
-  build:
+  build-job:
     runs-on: ubuntu-latest
     needs: checkpatterns
     outputs:
@@ -188,23 +188,18 @@ jobs:
           # TODO
           .build/rippled --unittest --unittest-jobs $(nproc)
 
+  build:
+    runs-on: ubuntu-latest
+    needs: build-job
+    steps:
+      - name: Dummy Build
+        run: |
+          echo "Dummy build relies upon build-job matrix"
+
   tests:
     runs-on: ubuntu-latest
-    needs: build
+    needs: build-job
     steps:
-#      - name: Checkout
-#        uses: actions/checkout@v4
-
-#      - name: Download build artifacts
-#        uses: actions/download-artifact@v4
-#        with:
-#          name: ${{ needs.build.outputs.artifact_name }}
-#          path: .build
-#
-#      - name: Set executable permissions
-#        run: |
-#          chmod +x .build/rippled
-
       - name: Run tests
         run: |
-          echo "dummy: .build/rippled --unittest --unittest-jobs $(nproc)"
+          echo "Dummy tests relies upon build-job matrix"