Webpacker error leads to internal server error

[mausquirk]

I did configure and run a new instance of decidim v0.27.4 and installed the "Decidim Participatory Documents" module as described in the README.

Testing the module with a simple Participatory processe I was able to add the component. Trying to "manage" the component I receive an Internal Server Error.

The error message in the log file starts as following:

I, [2023-12-17T16:00:08.007346 #1]  INFO -- : [cd129fc4-5a36-4ffc-bd28-02c08f8cc5e0] Processing by Decidim::ParticipatoryDocuments::Admin::DocumentsController#index as HTML
I, [2023-12-17T16:00:08.007444 #1]  INFO -- : [cd129fc4-5a36-4ffc-bd28-02c08f8cc5e0]   Parameters: {"participatory_process_slug"=>"test", "component_id"=>"4"}
I, [2023-12-17T16:00:08.058524 #1]  INFO -- : [cd129fc4-5a36-4ffc-bd28-02c08f8cc5e0] Completed 500 Internal Server Error in 51ms (ActiveRecord: 9.7ms | Allocations: 15907)
F, [2023-12-17T16:00:08.060279 #1] FATAL -- : [cd129fc4-5a36-4ffc-bd28-02c08f8cc5e0]   
[cd129fc4-5a36-4ffc-bd28-02c08f8cc5e0] Webpacker::Manifest::MissingEntryError (Webpacker can't find decidim_participatory_documents_admin.css in /code/public/decidim-packs/manifest.json. Possible causes:
1. You want to set webpacker.yml value of compile to true for your environment
   unless you are using the `webpack -w` or the webpack-dev-server.
2. webpack has not yet re-run to reflect updates.
3. You have misconfigured Webpacker's config/webpacker.yml file.
4. Your webpack configuration is not creating a manifest.
Your manifest contains:
{
...

This issue can be fixed with running bundle exec rake webpacker:compile
So this step should be added to the Readme file.