CircleCI: Skip entire workflow - circleci

Question

Basically I'm trying to skip the build if it's not a pull request or a certain branch, however I don't seem to be able to skip a job or a part of the workflow if this fails, so far the problem is that circleci step halt does nothing in my pipelines, example config here:
version: 2.1
orbs:
hello: circleci/hello-build#0.0.5
jobs:
build:
docker:
- image: docker:17.05.0-ce-git
steps:
- checkout
- setup_remote_docker
- run:
command: |
if [[ $(echo "$CIRCLE_PULL_REQUEST $CIRCLE_PULL_REQUESTS" | grep -c "pull") -gt 0 ]]; then
echo "Do stuff if it's a PR"
else
echo "Not a PR, Skipping."
circleci step halt # does nothing
circleci-agent step halt # does nothing
exit 0
fi
workflows:
"Hello Workflow":
jobs:
- hello/hello-build:
requires:
- build
filters:
branches:
only:
- testing
- /^(?!pull\/).*$/
tags:
only:
- /^pull\/.*$/
- build:
filters:
branches:
only:
- testing
- /^(?!pull\/).*$/
tags:
only:
- /^pull\/.*$/
This does not fail, and it works on pull requests but the hello/hello-build is executed anyway despite the circleci step halt commands.
Any help would be appreciated, thanks!

Answer 1

After creating a thread in their forums this is what worked: https://discuss.circleci.com/t/does-circleci-step-halt-works-with-version-2-1/36674/4
Go to account settings -> Personal API Tokens -> New token. Once you have the token go to the project and create a new environment variable something like CIRCLE_TOKEN and save it there.
Then in the config.yml you can run something like this to cancel the current workflow:
curl -X POST https://circleci.com/api/v2/workflow/${CIRCLE_WORKFLOW_ID}/cancel -H 'Accept: application/json' -u '${CIRCLE_TOKEN}:'
Then you will see something like: