refactor: Deflake and Try package

- feat: add CI multiplier
- refactor: readability
- feat: custom Sleep function
- refactor(integration): use custom Sleep
- feat: show Try progress
- feat(try): try response with status code
- refactor(try): use a dedicate package.
- refactor(integration): Try everywhere
- feat(CI): pass CI env var to Integration Tests.
- refactor(acme): increase timeout.
- feat(acme): show Traefik logs
- refactor(integration): use `http.StatusXXX`
- refactor: remove Sleep

integration/utils/traefikCmd_test.go

@@ -70,15 +70,15 @@ func TestHelperProcess(t *testing.T) {
 		argsStr := strings.Join(args, " ")
 		switch argsStr {
 		case "an exitCode 127":
-			fmt.Fprintf(os.Stderr, "an error has occurred with exitCode 127")
+			fmt.Fprint(os.Stderr, "an error has occurred with exitCode 127")
 			os.Exit(127)
 		case "an error":
-			fmt.Fprintf(os.Stderr, "an error has occurred")
+			fmt.Fprint(os.Stderr, "an error has occurred")
 			os.Exit(1)
 		case "it works":
-			fmt.Fprintf(os.Stdout, "it works")
+			fmt.Fprint(os.Stdout, "it works")
 		default:
-			fmt.Fprintf(os.Stdout, "no arguments")
+			fmt.Fprint(os.Stdout, "no arguments")
 		}
 	default:
 		fmt.Fprintf(os.Stderr, "Command %s not found.", cmd)