Add some instructions about running integration tests (#3319)
Add some instructions about running integration tests (#3319)

* Add some instructions about running integration tests

* Add missing newline escape

* Suggest running a clean build

vCaesar/gitea,typeless/gitea,typeless/gitea,kjellkvinge/gitea,sapk-fork/gitea,mjwwit/gitea,kubatyszko/gitea,mjwwit/gitea,tboerger/gitea,sapk-fork/gitea,tboerger/gitea,cez81/gitea,Bwko/gitea,vdbt/gitea,lafriks/gitea,dnmgns/gitea,lunny/gitea,lafriks/gitea,dnmgns/gitea,typeless/gitea,lunny/gitea,kjellkvinge/gitea,dl5rcw/gitea,sapk-fork/gitea,cez81/gitea,lunny/gitea,cez81/gitea,kubatyszko/gitea,kubatyszko/gitea,dnmgns/gitea,Bwko/gitea,kjellkvinge/gitea,sapk-fork/gitea,lafriks/gitea,vCaesar/gitea,go-gitea/gitea,Bwko/gitea,typeless/gitea,vdbt/gitea,tboerger/gitea,go-gitea/gitea,go-gitea/gitea