test-bot: don't `brew tests` for formula PRs. (#294)
test-bot: don't `brew tests` for formula PRs. (#294)

This adds >1m to every build on every node and it can't actually be
affected/fixed by formula PRs.
mahori/brew,claui/brew,EricFromCanada/brew,Homebrew/brew,konqui/brew,Linuxbrew/brew,sjackman/homebrew,MikeMcQuaid/brew,tonyg/homebrew,AnastasiaSulyagina/brew,muellermartin/dist,vitorgalvao/brew,Homebrew/brew,pseudocody/brew,jmsundar/brew,rwhogg/brew,EricFromCanada/brew,aw1621107/brew,tonyg/homebrew,JCount/brew,nandub/brew,reitermarkus/brew,MikeMcQuaid/brew,Linuxbrew/brew,gordonmcshane/homebrew,claui/brew,vitorgalvao/brew,reelsense/brew,tonyg/homebrew,maxim-belkin/brew,aw1621107/brew,alyssais/brew,maxim-belkin/brew,amar-laksh/brew_sudo,amar-laksh/brew_sudo,sjackman/homebrew,JCount/brew,mgrimes/brew,reitermarkus/brew,Linuxbrew/brew,DomT4/brew,AnastasiaSulyagina/brew,nandub/brew,MikeMcQuaid/brew,JCount/brew,ilovezfs/brew,sjackman/homebrew,toonetown/homebrew,Linuxbrew/brew,alyssais/brew,vitorgalvao/brew,maxim-belkin/brew,rwhogg/brew,konqui/brew,reelsense/brew,reitermarkus/brew,gordonmcshane/homebrew,claui/brew,jmsundar/brew,alyssais/brew,bfontaine/brew,konqui/brew,palxex/brew,EricFromCanada/brew,Homebrew/brew,amar-laksh/brew_sudo,nandub/brew,sjackman/homebrew,AnastasiaSulyagina/brew,toonetown/homebrew,bfontaine/brew,jmsundar/brew,gregory-nisbet/brew,gregory-nisbet/brew,DomT4/brew,bfontaine/brew,palxex/brew,DomT4/brew,zmwangx/brew,hanxue/linuxbrew,DomT4/brew,reelsense/brew,zmwangx/brew,reitermarkus/brew,pseudocody/brew,aw1621107/brew,toonetown/homebrew,ilovezfs/brew,staticfloat/brew,staticfloat/brew,zmwangx/brew,MikeMcQuaid/brew,Homebrew/brew,muellermartin/dist,mgrimes/brew,gordonmcshane/homebrew,mahori/brew,staticfloat/brew,hanxue/linuxbrew,vitorgalvao/brew,konqui/brew,mgrimes/brew,claui/brew,muellermartin/dist,nandub/brew,ilovezfs/brew,mahori/brew,gregory-nisbet/brew,rwhogg/brew,mahori/brew,EricFromCanada/brew,palxex/brew,JCount/brew,hanxue/linuxbrew,pseudocody/brew