Merge branch 'open_tool_for_self_hosting' into v5.0.0

.gitignore

.idea/material_theme_project_new.xml

.idea/vcs.xml

ExpressAPI/.env.vault

ExpressAPI/.idea/dataSources

ExpressAPI/assets/OpenAPI/OpenAPI.yaml

ExpressAPI/assets/assignment_gitlab_ci.yml

ExpressAPI/assets/exercise_gitlab_ci.yml

ExpressAPI/config.env

ExpressAPI/src/config/Config.ts

ExpressAPI/src/init.ts

ExpressAPI/src/managers/GitlabManager.ts

ExpressAPI/src/routes/AssignmentRoutes.ts

ExpressAPI/src/routes/BaseRoutes.ts

ExpressAPI/src/routes/ExerciseRoutes.ts

ExpressAPI/src/shared