Update developer docs to work on Fedora 40+

On Fedora 40 bundler installs by default to vendor/bundle and this
ignores the directory. While installing it was also noticed that
postgresql-server is the real server package and that the server needs
to be running. For simplicity it's configured to always start on boot.

.gitignore

@@ -44,6 +44,7 @@ config/hooks
 *.csv
 .envrc
 node_modules
+vendor/bundle
 vendor/ruby
 public/webpack
 .env*
@@ -55,4 +56,4 @@ npm-debug.log
 .nvmrc
 mkmf.log
 .yardoc/
-webpack/assets/javascripts/all_react_app_exports.js
+webpack/assets/javascripts/all_react_app_exports.js

developer_docs/foreman_dev_setup.asciidoc

@@ -55,8 +55,9 @@ Use the following steps to set up PostgreSQL on RPM based distributions:
 
 [source, bash]
 ....
-sudo dnf install postgresql
+sudo dnf install postgresql-server
 sudo postgresql-setup --initdb
+sudo systemctl enable --now postgresql
 sudo -u postgres createuser --createdb $USER
 ....