fix: support authentication with Open ID using Keycloak (#669) #none

* Changes for authentication with Open ID using Keycloak

* Select authentication method

* fix: missing params

* fix: minor update

---------

Co-authored-by: Sara <sara.jimenez@nuvu.cc>

.env.example

@@ -40,3 +40,16 @@ PDF_SERVICES_CLIENT_SECRET=
 
 # settings for PDF.js
 PDFJS_VERSION_DIST="pdfjs-4.0.379-dist"
+
+# variable for authentication method selection
+# for authentication with google leave empty
+# for authentication with keycloak :
+# AUTHENTICATION_METHOD="KEYCLOAK"
+
+AUTHENTICATION_METHOD=
+
+# settings for keycloak
+KEYCLOAK_SERVER_URL=
+KEYCLOAK_CLIENT_ID=
+KEYCLOAK_REALM=
+KEYCLOAK_CLIENT_SECRET=