ci(dispatcher): login to DHI in image building workflow

Author: Clemsazert

.github/workflows/dispatcher-build.yaml

@@ -65,6 +65,12 @@ jobs:
         run: chmod +x gradlew
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
+      - name: Login to Docker Hardened Images
+        uses: docker/login-action@v3
+        with:
+          registry: dhi.io
+          username: ${{ secrets.DHI_USERNAME }}
+          password: ${{ secrets.DHI_PASSWORD }}
       - name: Login to Container Registry
         uses: docker/login-action@v3
         with: