replace absolute paths in checks.md not to depend on local file system

Author: rhysd

docs/checks.md

@@ -2196,7 +2196,7 @@ test.yaml:12:5: "with" is only available for a reusable workflow call with "uses
    |
 12 |     with:
    |     ^~~~~
-test.yaml:19:11: could not read reusable workflow file for "./.github/workflows/not-existing.yml": open /Users/rhysd/.go/src/github.com/rhysd/actionlint/.github/workflows/not-existing.yml: no such file or directory [workflow-call]
+test.yaml:19:11: could not read reusable workflow file for "./.github/workflows/not-existing.yml": open /path/to/repo/.github/workflows/not-existing.yml: no such file or directory [workflow-call]
    |
 19 |     uses: ./.github/workflows/not-existing.yml
    |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

scripts/update-checks-doc/main.go

@@ -68,7 +68,11 @@ func runActionlint(src []byte) ([]byte, error) {
 		return nil, err
 	}
 
-	return out.Bytes(), nil
+	// Some error message contains absolute file paths. Replace them not to make the document depend
+	// on the current file system.
+	b := bytes.ReplaceAll(out.Bytes(), []byte(p.RootDir()), []byte("/path/to/repo"))
+
+	return b, nil
 }
 
 func update(in []byte) ([]byte, error) {