Confused on loading external traceparent into github-actions-based export

[msarahan]

My ultimate goal is to parse a Github run info record into OpenTelemetry spans, and export them to an OTel collector or some other service that accepts OTel traces. I'm trying to use GitHub Script for retrieving the github run info and parsing, and the use opentelemetry-js for forming the spans and sending them to an exporter. The parsing and the span creation are working fine, but the propagation of the traces is not. I'm trying to follow https://opentelemetry.io/docs/languages/js/propagation/#manual-context-propagation

I have tried to simplify my code as much as possible to isolate only the propagation part. Here's my code:

const opentelemetry = require('@opentelemetry/api');

var ctx = opentelemetry.propagation.extract(opentelemetry.context.active(), {"traceparent": "${{ env.traceparent }}", "tracestate": ""});

console.log("TRACEPARENT")
console.log("${{ env.traceparent }}")
console.log("OTel context after extracting")
console.log(ctx)

It's in a Github Actions workflow here: https://github.com/msarahan/telemetry-traceparent/blob/main/.github/workflows/run-test.yml

The output from a run shows the following for the console.log calls:

TRACEPARENT
00-397d8af9dc0e32f3c7a6714a3303b53dd1d66a7c9cd41bca9d83e3e7eeeb7f-ab995a5c9094497a-01
OTel context after extracting
BaseContext {
  _currentContext: Map(0) {},
  getValue: [Function (anonymous)],
  setValue: [Function (anonymous)],
  deleteValue: [Function (anonymous)]
}

I believe that the BaseContext object should have the traceparent info in its _currentContext map somehow, and that the lack of any data here means that something isn't right with the extraction. Are there runtime assumptions behind https://opentelemetry.io/docs/languages/js/propagation/#manual-context-propagation that the GitHub Actions Script runtime environment does not meet? Am I missing something else?