Notes on upgrading docker installation (#5395)
Notes on upgrading docker installation (#5395)

* Notes on upgrading docker installation

Basis from [gogs/gogs](https://github.com/gogs/gogs/blob/master/docker/README.md)

* Feedback from @sapk to use docker-compose only

lunny/gitea,cez81/gitea,kubatyszko/gitea,typeless/gitea,sapk-fork/gitea,cez81/gitea,Bwko/gitea,lunny/gitea,lafriks/gitea,go-gitea/gitea,go-gitea/gitea,vCaesar/gitea,vCaesar/gitea,typeless/gitea,cez81/gitea,sapk-fork/gitea,vdbt/gitea,typeless/gitea,lafriks/gitea,vdbt/gitea,typeless/gitea,kubatyszko/gitea,lafriks/gitea,sapk-fork/gitea,lunny/gitea,kubatyszko/gitea,go-gitea/gitea,sapk-fork/gitea,Bwko/gitea,Bwko/gitea