COCOS-492: Cache VCEK on aTLS verification (#524)

* initial commit

* made changes based on errors

* remove unnecessary log

---------

Co-authored-by: Jovan Djukic <jovan.djukic@ultraviolet.com>

cmd/agent/main.go

@@ -29,6 +29,7 @@ import (
 	"github.com/ultravioletrs/cocos/pkg/atls"
 	"github.com/ultravioletrs/cocos/pkg/attestation"
 	"github.com/ultravioletrs/cocos/pkg/attestation/azure"
+	"github.com/ultravioletrs/cocos/pkg/attestation/quoteprovider"
 	"github.com/ultravioletrs/cocos/pkg/attestation/tdx"
 	"github.com/ultravioletrs/cocos/pkg/attestation/vtpm"
 	"github.com/ultravioletrs/cocos/pkg/clients"
@@ -155,6 +156,13 @@ func main() {
 		return
 	}
 
+	err = quoteprovider.FetchCertificates(uint(cfg.Vmpl))
+	if err != nil {
+		logger.Error(fmt.Sprintf("failed to fetch certificates: %s", err))
+		exitCode = 1
+		return
+	}
+
 	svc := newService(ctx, logger, eventSvc, provider, cfg.Vmpl)
 
 	if err := os.MkdirAll(storageDir, 0o755); err != nil {