use 127.0.0.1 for ipv4 test

Author: Steffen Wendzel

.github/workflows/build-tests.yml

@@ -344,11 +344,10 @@ jobs:
           && scp ${{ matrix.distribution }}:/usr/local/etc/wendzelnntpd/ssl/ca-key.pem tmp/ca-self.key
       - name: Create client cert for mutual tls tests
         run: cd unittesting && ./create-client-cert.sh
-      - name: get addr ipv4 revised
+      - name: get addr ipv4 revised-to-local-only
         run: |
-          IPV4=$(ssh ${{ matrix.distribution }} '/sbin/ifconfig | awk "/inet / && !/127.0.0.1/ { print \$2; exit }"')
+          IPV4="127.0.0.1"
           echo "ipv4=$IPV4" >> $GITHUB_ENV
-          echo "ipv4=$IPV4"
       - name: get container ipv6
         run: |
           IPV6=$(ssh ${{ matrix.distribution }} '/sbin/ifconfig | awk "/inet6 / && !/fe80/ && !/::1/ { print \$2; exit }"')