feat(db): store metadata as a file (#464)

* refactor: wrap errors

* feat(db): add the metadata file

* test(db): re-generate mocks

* fix(app): read metadata from the file in showVersion

* fix: open the database after downloading it

* fix(operation): use UpdateMetadata

* chore(mod): update dependency

* test(integration): fix tests

* fix(conf): rename TRIVY_NONSSL to TRIVY_NON_SSL

integration/client_server_test.go

@@ -330,7 +330,8 @@ func TestClientServer(t *testing.T) {
 	for _, c := range cases {
 		t.Run(c.name, func(t *testing.T) {
 			// Copy DB file
-			cacheDir := gunzipDB()
+			cacheDir, err := gunzipDB()
+			require.NoError(t, err)
 			defer os.RemoveAll(cacheDir)
 
 			port, err := getFreePort()