feat(cli): add display of open ports in coder show (#16464)

Relates to https://github.com/coder/coder/issues/16418 -- devcontainers
will be shown in a similar manner.

Without ports (status quo):
![Screenshot 2025-02-10 at 12 50
46](https://github.com/user-attachments/assets/c25fd532-2e35-469c-bb28-26e59ded3eb4)

With ports:
![Screenshot 2025-02-10 at 12 50
06](https://github.com/user-attachments/assets/a4671349-5866-4e1e-848e-a6e819479793)

cli/show.go

@@ -1,8 +1,13 @@
 package cli
 
 import (
+	"sort"
+	"sync"
+
 	"golang.org/x/xerrors"
 
+	"github.com/google/uuid"
+
 	"github.com/coder/coder/v2/cli/cliui"
 	"github.com/coder/coder/v2/codersdk"
 	"github.com/coder/serpent"
@@ -26,10 +31,42 @@ func (r *RootCmd) show() *serpent.Command {
 			if err != nil {
 				return xerrors.Errorf("get workspace: %w", err)
 			}
-			return cliui.WorkspaceResources(inv.Stdout, workspace.LatestBuild.Resources, cliui.WorkspaceResourcesOptions{
+
+			options := cliui.WorkspaceResourcesOptions{
 				WorkspaceName: workspace.Name,
 				ServerVersion: buildInfo.Version,
-			})
+			}
+			if workspace.LatestBuild.Status == codersdk.WorkspaceStatusRunning {
+				// Get listening ports for each agent.
+				options.ListeningPorts = fetchListeningPorts(inv, client, workspace.LatestBuild.Resources...)
+			}
+			return cliui.WorkspaceResources(inv.Stdout, workspace.LatestBuild.Resources, options)
 		},
 	}
 }
+
+func fetchListeningPorts(inv *serpent.Invocation, client *codersdk.Client, resources ...codersdk.WorkspaceResource) map[uuid.UUID]codersdk.WorkspaceAgentListeningPortsResponse {
+	ports := make(map[uuid.UUID]codersdk.WorkspaceAgentListeningPortsResponse)
+	var wg sync.WaitGroup
+	var mu sync.Mutex
+	for _, res := range resources {
+		for _, agent := range res.Agents {
+			wg.Add(1)
+			go func() {
+				defer wg.Done()
+				lp, err := client.WorkspaceAgentListeningPorts(inv.Context(), agent.ID)
+				if err != nil {
+					cliui.Warnf(inv.Stderr, "Failed to get listening ports for agent %s: %v", agent.Name, err)
+				}
+				sort.Slice(lp.Ports, func(i, j int) bool {
+					return lp.Ports[i].Port < lp.Ports[j].Port
+				})
+				mu.Lock()
+				ports[agent.ID] = lp
+				mu.Unlock()
+			}()
+		}
+	}
+	wg.Wait()
+	return ports
+}