Local dependency - Error Package "XYZ refers to a non-existing file ...

Hello,

the build/deployment of my app was working perfectly since this morning when I need to to add a local package as dependency: **yarn add file:./ckeditor5**

Now my package.json looks like this:
````
...
"ckeditor5-custom-build": "file:./ckeditor5",
...
````

The folder ckeditor5 is present correctly in my app root folder as well as in my git repo.

When The workflow run I get the following error message:
````
Using Node version:
v14.15.1

Using Yarn version:
1.22.10

Installing production dependencies in '/github/workspace/apps/my-app/.oryx_prod_node_modules'...

Running 'yarn install --prefer-offline --production'...

yarn install v1.22.10
[1/4] Resolving packages...
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
error Package "ckeditor5-custom-build" refers to a non-existing file '"/github/workspace/apps/my-app/.oryx_prod_node_modules/ckeditor5"'.

---End of Oryx build logs---
Oryx has failed to build the solution.
````

This is my action file:

````
name: Azure Static Web Apps CI/CD

on:
push:
branches:
- main
pull_request:
types: [opened, synchronize, reopened, closed]
branches:
- main

jobs:
build_and_deploy_job:
if: github.event_name == 'push' || (github.event_name == 'pull_request' && github.event.action != 'closed')
runs-on: ubuntu-latest
env:
CI: ""
name: Build and Deploy Job
steps:
- uses: actions/checkout@v2
with:
submodules: true
- name: Build And Deploy
id: builddeploy
uses: Azure/static-web-apps-deploy@v0.0.1-preview
with:
azure_static_web_apps_api_token: ${{ secrets.AZURE_STATIC_WEB_APPS_API_TOKEN_ORANGE_DUNE_015D5D500 }}
repo_token: ${{ secrets.GITHUB_TOKEN }} # Used for Github integrations (i.e. PR comments)
action: "upload"
###### Repository/Build Configurations - These values can be configured to match you app requirements. ######
# For more information regarding Static Web App workflow configurations, please visit: https://aka.ms/swaworkflowconfig
app_location: "/apps/my-app" # App source code path
output_location: "build" # Built app content directory - optional
###### End of Repository/Build Configurations ######

close_pull_request_job:
if: github.event_name == 'pull_request' && github.event.action == 'closed'
runs-on: ubuntu-latest
name: Close Pull Request Job
env:
CI: ""
steps:
- name: Close Pull Request
id: closepullrequest
uses: Azure/static-web-apps-deploy@v0.0.1-preview
with:
azure_static_web_apps_api_token: ${{ secrets.AZURE_STATIC_WEB_APPS_API_TOKEN_ORANGE_DUNE_015D5D500 }}
action: "close"
````

Any suggestion?