chore: support configurable Go module proxy

scripts/verifyHTTP2.py

@@ -11,6 +11,7 @@ import sys
 def main() -> None:
     parser = argparse.ArgumentParser(description=__doc__)
     parser.add_argument("--image", default="golang:1.25")
+    parser.add_argument("--goproxy", default="", help="optional Go module proxy passed to the container")
     parser.add_argument("--duration", default="30m")
     parser.add_argument("--timeout", default="35m", help="go test timeout (default: 35m)")
     parser.add_argument("--gomaxprocs", type=int, default=2)
@@ -27,6 +28,10 @@ def main() -> None:
         "-v", f"{root}:/workspace", "-w", "/workspace",
         "-e", "GOWORK=off", "-e", f"GOMAXPROCS={args.gomaxprocs}",
         "-e", f"GO_OMNI_HTTP2_SOAK_DURATION={args.duration}",
+    ]
+    if args.goproxy:
+        command += ["-e", f"GOPROXY={args.goproxy}"]
+    command += [
         args.image, "go", "test", "-race", "-timeout", args.timeout, "./transport/http2",
         "-run", "^TestTLSSoak$", "-count=1",
     ]