fix error message when invalid escape is found in glob

README.md

@@ -56,7 +56,7 @@ test.yaml:3:5: unexpected key "branch" for "push" section. expected one of "bran
   |
 3 |     branch: main
   |     ^~~~~~~
-test.yaml:5:11: character '\' is invalid for branch and tag names. only special characters [, ?, +, *, \ ! can be escaped with \. see `man git-check-ref-format` for more details. note that regular expression is unavailable. note: filter pattern syntax is explained at https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet [glob]
+test.yaml:5:11: character '\' is invalid for branch and tag names. only special characters [, ?, +, *, \, ! can be escaped with \. see `man git-check-ref-format` for more details. note that regular expression is unavailable. note: filter pattern syntax is explained at https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet [glob]
   |
 5 |       - 'v\d+'
   |           ^~~~

glob.go

@@ -104,7 +104,7 @@ func (v *globValidator) validateNext() bool {
 		default:
 			// file path can contain '\' (`mkdir 'foo\bar'` works)
 			if v.isRef {
-				v.invalidRefChar('\\', "only special characters [, ?, +, *, \\ ! can be escaped with \\")
+				v.invalidRefChar('\\', "only special characters [, ?, +, *, \\, ! can be escaped with \\")
 				c = v.scan.Next()
 			}
 		}

glob_test.go

@@ -295,7 +295,7 @@ func TestValidateGlobGitRefNameInvalidCharacter(t *testing.T) {
 		{
 			what:     "escaped non-special character",
 			input:    `\d`,
-			expected: "only special characters [, ?, +, *, \\ ! can be escaped with \\",
+			expected: "only special characters [, ?, +, *, \\, ! can be escaped with \\",
 		},
 		{
 			what:  "prohibited characters for ref names",
@@ -314,11 +314,11 @@ func TestValidateGlobGitRefNameInvalidCharacter(t *testing.T) {
 			expectedAll: []string{
 				"ref name must not start with /",
 				"ref name cannot contain spaces, ~, ^, :, [, ?, *",
-				"only special characters [, ?, +, *, \\ ! can be escaped with \\",
-				"only special characters [, ?, +, *, \\ ! can be escaped with \\",
-				"only special characters [, ?, +, *, \\ ! can be escaped with \\",
-				"only special characters [, ?, +, *, \\ ! can be escaped with \\",
-				"only special characters [, ?, +, *, \\ ! can be escaped with \\",
+				"only special characters [, ?, +, *, \\, ! can be escaped with \\",
+				"only special characters [, ?, +, *, \\, ! can be escaped with \\",
+				"only special characters [, ?, +, *, \\, ! can be escaped with \\",
+				"only special characters [, ?, +, *, \\, ! can be escaped with \\",
+				"only special characters [, ?, +, *, \\, ! can be escaped with \\",
 				"ref name must not end with / and .",
 			},
 		},

testdata/err/glob_more.out

@@ -1,7 +1,7 @@
 test.yaml:6:12: invalid glob pattern. unexpected character ']' while checking character match []. character match with single character is useless. simply use x instead of [x]. note: filter pattern syntax is explained at https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet [glob]
 test.yaml:7:10: character ' ' is invalid for branch and tag names. ref name cannot contain spaces, ~, ^, :, [, ?, *. see `man git-check-ref-format` for more details. note that regular expression is unavailable. note: filter pattern syntax is explained at https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet [glob]
 test.yaml:10:9: character '/' is invalid for branch and tag names. ref name must not start with /. see `man git-check-ref-format` for more details. note that regular expression is unavailable. note: filter pattern syntax is explained at https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet [glob]
-test.yaml:10:11: character '\' is invalid for branch and tag names. only special characters [, ?, +, *, \ ! can be escaped with \. see `man git-check-ref-format` for more details. note that regular expression is unavailable. note: filter pattern syntax is explained at https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet [glob]
+test.yaml:10:11: character '\' is invalid for branch and tag names. only special characters [, ?, +, *, \, ! can be escaped with \. see `man git-check-ref-format` for more details. note that regular expression is unavailable. note: filter pattern syntax is explained at https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet [glob]
 test.yaml:10:14: character '/' is invalid for branch and tag names. ref name must not end with / and .. see `man git-check-ref-format` for more details. note that regular expression is unavailable. note: filter pattern syntax is explained at https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet [glob]
 test.yaml:11:12: invalid glob pattern. unexpected EOF while checking end of character match []. missing ]. note: filter pattern syntax is explained at https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet [glob]
 test.yaml:12:13: invalid glob pattern. unexpected character '0' while checking character range in []. start of range '9' (57) is larger than end of range '0' (48). note: filter pattern syntax is explained at https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet [glob]

testdata/examples/main.out

@@ -1,5 +1,5 @@
 test.yaml:3:5: unexpected key "branch" for "push" section. expected one of "branches", "branches-ignore", "paths", "paths-ignore", "tags", "tags-ignore", "types", "workflows" [syntax-check]
-test.yaml:5:11: character '\' is invalid for branch and tag names. only special characters [, ?, +, *, \ ! can be escaped with \. see `man git-check-ref-format` for more details. note that regular expression is unavailable. note: filter pattern syntax is explained at https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet [glob]
+test.yaml:5:11: character '\' is invalid for branch and tag names. only special characters [, ?, +, *, \, ! can be escaped with \. see `man git-check-ref-format` for more details. note that regular expression is unavailable. note: filter pattern syntax is explained at https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet [glob]
 /test\.yaml:10:28: label "linux-latest" is unknown\. available labels are .+\. if it is a custom label for self-hosted runner, set list of labels in actionlint\.yaml config file \[runner-label\]/
 test.yaml:13:41: "github.event.head_commit.message" is potentially untrusted. avoid using it directly in inline scripts. instead, pass it through an environment variable. see https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions for more details [expression]
 test.yaml:17:11: input "node_version" is not defined in action "actions/setup-node@v3". available inputs are "always-auth", "architecture", "cache", "cache-dependency-path", "check-latest", "node-version", "node-version-file", "registry-url", "scope", "token" [action]