User Input (#119)

Port the User Input feature from the previous version of the app. This
is currently being used to verify a few different prompts for ssh.

pkg/shellexec/shellexec.go

@@ -17,6 +17,7 @@ import (
 	"strings"
 	"sync"
 	"syscall"
+	"time"
 
 	"github.com/creack/pty"
 	"github.com/wavetermdev/thenextwave/pkg/remote"
@@ -114,7 +115,7 @@ func checkCwd(cwd string) error {
 var userHostRe = regexp.MustCompile(`^([a-zA-Z0-9][a-zA-Z0-9._@\\-]*@)?([a-z0-9][a-z0-9.-]*)(?::([0-9]+))?$`)
 
 func StartRemoteShellProc(termSize TermSize, cmdStr string, cmdOpts CommandOptsType, remoteName string) (*ShellProc, error) {
-	ctx, cancelFunc := context.WithCancel(context.Background())
+	ctx, cancelFunc := context.WithTimeout(context.Background(), 60*time.Second)
 	defer cancelFunc()
 
 	var shellPath string