don't spam duplicate warnings in github_context

Thanks to go-git/go-git#530, act will spam the
console/log with a billion warnings like this:

WARN[0000] unable to get git repo: branch config: invalid merge

when a GitHub PR branch is checked out.

pkg/model/github_context.go

@@ -4,11 +4,17 @@ import (
  "context"
  "fmt"
  "strings"
+ "sync"
 
  "github.com/nektos/act/pkg/common"
  "github.com/nektos/act/pkg/common/git"
 )
 
+var (
+ loggedWarnings = make(map[string]bool)
+ mu sync.Mutex
+)
+
 type GithubContext struct {
  Event map[string]interface{} `json:"event"`
  EventPath string `json:"event_path"`
@@ -168,7 +174,11 @@ func (ghc *GithubContext) SetRepositoryAndOwner(ctx context.Context, githubInsta
  if ghc.Repository == "" {
  repo, err := git.FindGithubRepo(ctx, repoPath, githubInstance, remoteName)
  if err != nil {
- common.Logger(ctx).Warningf("unable to get git repo: %v", err)
+ warningMsg := fmt.Sprintf("unable to get git repo: %v", err)
+ if !hasLoggedWarning(warningMsg) {
+ common.Logger(ctx).Warningf(warningMsg)
+ markWarningAsLogged(warningMsg)
+ }
  return
  }
  ghc.Repository = repo
@@ -211,3 +221,16 @@ func (ghc *GithubContext) SetBaseAndHeadRef() {
  }
  }
 }
+
+func hasLoggedWarning(msg string) bool {
+ mu.Lock()
+ defer mu.Unlock()
+ _, exists := loggedWarnings[msg]
+ return exists
+}
+
+func markWarningAsLogged(msg string) {
+ mu.Lock()
+ defer mu.Unlock()
+ loggedWarnings[msg] = true
+}