refactor: Changed Client.CreateFile to be more generic

The GitHub implementation of CreateFile implicitly uses HomeBrew data.
Added parameters for CommitAuthor and Repo so the call site can specify
these parameters based on the context.

internal/client/github.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/apex/log"
 	"github.com/google/go-github/github"
+	"github.com/goreleaser/goreleaser/config"
 	"github.com/goreleaser/goreleaser/context"
 	"golang.org/x/oauth2"
 )
@@ -39,6 +40,8 @@ func NewGitHub(ctx *context.Context) (Client, error) {
 
 func (c *githubClient) CreateFile(
 	ctx *context.Context,
+	commitAuthor config.CommitAuthor,
+	repo config.Repo,
 	content bytes.Buffer,
 	path string,
 ) (err error) {