Ensure that git daemon export ok is created for mirrors (#17243)

* Ensure that git daemon export ok is created for mirrors

There is an issue with #16508 where it appears that create repo requires that the
repo does not exist. This causes #17241 where an error is reported because of this.

This PR fixes this and also runs update-server-info for mirrors and generated repos.

Fix #17241

Signed-off-by: Andrew Thornton <art27@cantab.net>

models/db/context.go

@@ -31,6 +31,14 @@ type Context struct {
 	e Engine
 }
 
+// WithEngine returns a db.Context from a context.Context and db.Engine
+func WithEngine(ctx context.Context, e Engine) *Context {
+	return &Context{
+		Context: ctx,
+		e:       e,
+	}
+}
+
 // Engine returns db engine
 func (ctx *Context) Engine() Engine {
 	return ctx.e