Add Docker Hub login step in pull request workflow

Added Docker Hub login step to avoid rate limits.

Signed-off-by: Finn Rades <64548817+zOnlyKroks@users.noreply.github.com>

Author: zOnlyKroks

.github/workflows/pull-request.yaml

@@ -110,6 +110,12 @@ jobs:
       - name: Setup kubectl
         uses: azure/setup-kubectl@776406bce94f63e41d621b960d78ee25c8b76ede # v4.0.1
 
+      - name: Login to Docker Hub to avoid rate limits
+        uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567 # v3.3.0
+        with:
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
       - name: Create kind cluster
         uses: helm/kind-action@a1b0e391336a6ee6713a0583f8c6240d70863de3 # v1.12.0
         with: