Introduce more stringent golangci-lint checks & address issues raised#538

Merged

tstromberg merged 12 commits intotinkerbell:mainfrom tstromberg:lint

Oct 4, 2021

+1,136-982

Commits on Sep 30, 2021

Replace uses of tx.Exec with tx.ExecContext
tstromberg
committed

Commits on Oct 1, 2021

Address merge conflicts
tstromberg
committed