Disable OpenSSL during JS tests

PhantomJS is outdated and tries to use parts of OpenSSL that are no
longer there.  We shouldn't need SSL for the JS tests, so this attempts
to disable it temporarily during the test run.

.github/workflows/build-and-test.yml

@@ -144,7 +144,7 @@ jobs:
           npm ci
 
       - name: npm test
-        run: xvfb-run -a npm test
+        run: OPENSSL_CONF=/dev/null xvfb-run -a npm test
         working-directory: ./python/nav/web/static/js
 
       - name: Upload JavaScript test reports