Add initial retry for end graphql server connection.

.gitignore

@@ -1,3 +1,4 @@
 graphql-proxy
 test.sh
-banned.json*
+banned.json*
+dist/

main.go

@@ -5,12 +5,15 @@ import (
 	"os"
 	"strings"
 	"sync"
+	"time"
 
+	"github.com/avast/retry-go/v4"
 	"github.com/gofiber/fiber/v2/middleware/proxy"
 	"github.com/gookit/goutil/envutil"
 	graphql "github.com/lukaszraczylo/go-simple-graphql"
 	libpack_cache "github.com/lukaszraczylo/graphql-monitoring-proxy/cache"
 	libpack_config "github.com/lukaszraczylo/graphql-monitoring-proxy/config"
+	libpack_logger "github.com/lukaszraczylo/graphql-monitoring-proxy/logging"
 	libpack_logging "github.com/lukaszraczylo/graphql-monitoring-proxy/logging"
 )
 
@@ -118,6 +121,33 @@ func parseConfig() {
 func main() {
 	parseConfig()
 	StartMonitoringServer()
+
+	err := retry.Do(
+		func() error {
+			_, err := cfg.Client.GQLClient.Query(healthCheckQueryStr, nil, nil)
+			return err
+		},
+		retry.Attempts(10),
+		retry.Delay(1*time.Second),
+		retry.OnRetry(func(n uint, err error) {
+			cfg.Logger.Warning(&libpack_logger.LogMessage{
+				Message: "Retrying initial connection to GraphQL server",
+				Pairs: map[string]interface{}{
+					"attempt": n + 1,
+					"error":   err.Error(),
+				},
+			})
+		}),
+	)
+
+	if err != nil {
+		cfg.Logger.Critical(&libpack_logger.LogMessage{
+			Message: "Failed to establish initial connection to GraphQL server",
+			Pairs:   map[string]interface{}{"error": err.Error()},
+		})
+		os.Exit(1)
+	}
+
 	StartHTTPProxy()
 }