title: GITHUB ACTIONS replace character in string
body: <p>I'm trying to replace a character in a variable within a GITHUB actions step</p>
  <pre><code>  - name: Set Up DB Name
      run: |
        DB_NAME=&quot;${GITHUB_REF_SLUG/-/_}&quot;
        echo $DB_NAME
  </code></pre>
  <p>I'm getting a bad request error</p>
  <p>What am I doing wrong?</p>