Workflow is not shown so I cannot run it manually (Github Actions)

I created the workflow Test but there is no Run workflow button to run it manually.

This is my test.yml file. Is there anything missing?

name: Test

on:
  release:
    types: [created]
  
jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2

      - name: Run a one-line script
        run: echo Hello, world!

You need to put workflow_dispatch: under on:.

name: Test

on:
  release:
    types: [created]
  workflow_dispatch: # Put here!!
  
jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2

      - name: Run a one-line script
        run: echo Hello, world!

Then, a Run workflow button is shown.

It's ok to put workflow_dispatch: before release:. It works as well.

name: Test

on:
  workflow_dispatch: # Putting here is also fine!!
  release:
    types: [created]
  
jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2

      - name: Run a one-line script
        run: echo Hello, world!