CI: weekly QUIC Interop: try to fix private image

for some reason image built in HAProxy workflow is "private", it
is succesfully built, but fails to pull. Let's try explicit docker login
for run job as well

.github/workflows/quic-interop-libressl.yml

@@ -52,6 +52,13 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Install tshark
         run: |
           sudo apt-get update