feat: option to use the matchers file inside the Official GitHub Action

Author: ldez

pkg/printers/githubaction_problem_matchers.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"os"
 	"path/filepath"
+	"strconv"
 
 	"github.com/golangci/golangci-lint/pkg/result"
 )
@@ -85,7 +86,12 @@ func (p *GitHubActionProblemMatchers) Print(issues []result.Issue) error {
 
 	_, _ = fmt.Fprintln(p.w, "::debug::problem matcher definition file: "+filename)
 
-	_, _ = fmt.Fprintln(p.w, "::add-matcher::"+filename)
+	// Used by the official GitHub Action (https://github.com/golangci/golangci-lint-action).
+	// The problem matchers is embedded inside the GitHub Action to avoid errors:
+	// https://github.com/golangci/golangci-lint/issues/4695
+	if ok, _ := strconv.ParseBool(os.Getenv("GOLANGCI_LINT_SKIP_GHA_PM_INSTALL")); !ok {
+		_, _ = fmt.Fprintln(p.w, "::add-matcher::"+filename)
+	}
 
 	for ind := range issues {
 		_, err := fmt.Fprintln(p.w, formatIssueAsProblemMatcher(&issues[ind]))