[SOLVED] DRONE_BRANCH can't be used to interpolate template in slack plugin

Drone Support
1

Hi All

it seems that it is not possible to do such a thing with the slack plugin, the $${DRONE_BRANCH} environment variable is not interpolated, am I doing something wrong ?

 slack-post-automerge:
    image: plugins/slack
    webhook: something
    channel: some_channel
    username: some_username
    template: file:///tmp/$${DRONE_BRANCH}-pr_status.txt
    when:
      event: [push]
      branch:
        include: [some_branch]
    volumes:
      - /tmp:/tmp

I also tried this variation without more success;

 slack-post-automerge:
    image: plugins/slack
    webhook: something
    channel: some_channel
    username: some_username
    template: file:///tmp/{{ build.branch }}-pr_status.txt
    when:
      event: [push]
      branch:
        include: [some_branch]
    volumes:
      - /tmp:/tmp

EDIT: Solved using following syntax

 slack-post-automerge:
    image: plugins/slack
    webhook: something
    channel: some_channel
    username: some_username
    template: file:///tmp/${DRONE_BRANCH}-pr_status.txt
    when:
      event: [push]
      branch:
        include: [some_branch]
    volumes:
      - /tmp:/tmp