test: replace hardcoded localhost with actual hostname

Author: develop7

test/io/postgrest.py

@@ -95,16 +95,16 @@ def run(
     with tempfile.TemporaryDirectory() as tmpdir:
         if port:
             env["PGRST_SERVER_PORT"] = str(port)
-            env["PGRST_SERVER_HOST"] = host or "localhost"
-            baseurl = f"http://localhost:{port}"
+            env["PGRST_SERVER_HOST"] = hostname = host or "localhost"
+            baseurl = f"http://{hostname}:{port}"
         else:
             socketfile = pathlib.Path(tmpdir) / "postgrest.sock"
             env["PGRST_SERVER_UNIX_SOCKET"] = str(socketfile)
             baseurl = "http+unix://" + urllib.parse.quote_plus(str(socketfile))
 
         adminport = freeport(port)
         env["PGRST_ADMIN_SERVER_PORT"] = str(adminport)
-        adminurl = f"http://localhost:{adminport}"
+        adminurl = f"http://{hostname}:{adminport}"
 
         command = [POSTGREST_BIN]
         env["HPCTIXFILE"] = hpctixfile()