Fix gosec, govet, and errorlint linter errors

Co-authored-by: Junie <junie@jetbrains.com>

internal/webserver/client.go

@@ -27,7 +27,7 @@ type VaultClient struct {
 func NewVaultClient(addr, caCertPath string) (*VaultClient, error) {
 	tlsCfg := &tls.Config{MinVersion: tls.VersionTLS12}
 	if caCertPath != "" {
-		pemData, err := os.ReadFile(caCertPath)
+		pemData, err := os.ReadFile(caCertPath) //nolint:gosec
 		if err != nil {
 			return nil, fmt.Errorf("webserver: read CA cert: %w", err)
 		}