Comments in tags input are treated as tags literally

[pallxk]

Behaviour

Comments (# ...) in tags input are treated as tags literally. They should be ignored; this syntax is also used extensively in the snippets in README.md.

If comments in tags are supposed to be treated literally, then the use of it in snippets in README can be confusing for newcomers.

Steps to reproduce this issue

Simply trigger the workflow using the configuration below.

Expected behaviour

# minimal should be ignored and not parsed as a docker tag.

Actual behaviour

# minimal parsed as a docker tag, and use it in later steps cause errors as test:# minimal is not a valid repository/tag.

Configuration

• Repository URL (if public):
• Build URL (if public):

on:
  push:

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      -
        name: Check out
        uses: actions/checkout@v2
      -
        name: Docker meta
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: test
          tags: |
            # minimal
            type=edge

Logs

Download the log file of your build
and attach it to this issue.

logs_7.zip