Harden production workflows and agent admission

agent/internal/client/client.go

@@ -29,7 +29,10 @@ func New(baseURL, token, agentID string) *Client {
 		baseURL: strings.TrimRight(baseURL, "/"),
 		token:   token,
 		agentID: agentID,
-		http:    &http.Client{Timeout: 15 * time.Second},
+		http: &http.Client{
+			Timeout:   15 * time.Second,
+			Transport: &http.Transport{DisableKeepAlives: true},
+		},
 	}
 }