DangerJS fails in github actions

Hello! Trying to figure out the best way to run danger via GitHub actions. I have gotten to the point of the action running and finding my dangerfile no problem, but the danger.github API is coming back null.

I have seen this happen when I run the danger local command as well, where the other namespaces (eg danger.git) are fine, but clearly there is no PR to reference so the danger.github response being null makes sense to me.

Here is that config:

workflow "Dangerfile JS Eval" {
  on = "pull_request"
  resolves = "Danger JS"
}

action "Danger JS" {
  uses = "danger/danger-js@master"
  secrets = ["GITHUB_TOKEN"]
  args = "--dangerfile ./dangerfile.ts"
}

I have also tried just running a typical bash script via github actions (just following the docs, with a Dockerfile and an entrypoint.sh). I can run the following script and have the same issue:

#!/bin/sh -l

set -eu

export DANGER_GITHUB_API_TOKEN="$GITHUB_TOKEN"
yarn global add danger

# Run danger
danger --dangerfile="./dangerfile.ts" ci

This yields a null value for danger.github as well.

My last attempt was to use the --external-ci-provider "GitHubActions" and I got this response: could not load CI provider at GitHubActions due to Error: ENOENT: no such file or directory, stat '/github/workspace/GitHubActions'

Again, I can run the danger pr https://github/path/to/pr and it runs fine, and that bash script currently works on our CircleCi.

Any information/links/examples for Github Actions you can provide would be really helpful! If there is someway I can help document/contribute let me know.

Thanks!

[mcpengelly]

For those that come after me. I’ll provide what i got working based on @mattyfresh advice:

<project root>/run-danger/Dockerfile

FROM node:8

LABEL "com.github.actions.name"="dangerjs"
LABEL "com.github.actions.description"="run dangerjs pr checks"
LABEL "com.github.actions.icon"="mic"
LABEL "com.github.actions.color"="purple"

ADD entrypoint.sh /entrypoint.sh
ENTRYPOINT ["/entrypoint.sh"]

<project root>/run-danger/entrypoint.sh

#!/bin/sh -l

# Install danger cli on the machine
yarn global add danger

# install needed dependencies
yarn

# Run danger
danger --dangerfile "./dangerfile.js" ci

<project root>/.github/main.workflow

workflow "Dangerfile JS Eval" {
  on = "pull_request"
  resolves = "Danger JS"
}
action "Danger JS" {
  uses = "./run-danger/"
  secrets = ["GITHUB_TOKEN"]
}

Hope this helps someone.

[fbartho]

I concur that the linked PR fixed my issue!