ignore workspace root check in changelog workflow (arduino#960)

Author: Alberto Iannaccone

.github/workflows/compose-full-changelog.yaml

@@ -32,7 +32,7 @@ jobs:
       - name: Create full changelog
         id: full-changelog
         run: |
-          yarn add @octokit/rest
+          yarn add @octokit/rest --ignore-workspace-root-check
           mkdir "${{ github.workspace }}/${{ env.CHANGELOG_ARTIFACTS }}"
 
           # Get the changelog file name to build