feat(third_party/gopkgs): add charmbracelet/{bubbletea,bubbles}

A small go TUI framework based on the Elm Architecture.

Change-Id: I0c400a7b25af682735bfc5061db179e5d1dd75ab
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2853
Reviewed-by: Profpatsch <mail@profpatsch.de>
Reviewed-by: lukegb <lukegb@tvl.fyi>
Tested-by: BuildkiteCI

third_party/gopkgs/github.com/charmbracelet/bubbletea/default.nix

@@ -0,0 +1,28 @@
+{ depot, pkgs, ... }:
+
+depot.nix.buildGo.external {
+  path = "github.com/charmbracelet/bubbletea";
+  src =
+    let gitSrc = pkgs.fetchFromGitHub {
+        owner = "charmbracelet";
+        repo = "bubbletea";
+        rev = "v0.13.1";
+        sha256 = "0yf2fjkvx8ym9n6f3qp2z7sxs0qsfpj148sfvbrp38k67s3h20cs";
+      };
+    # The examples/ directory is fairly extensive,
+    # but it also adds most of the dependencies.
+    in pkgs.runCommand gitSrc.name {} ''
+      mkdir -p $out
+      ln -s "${gitSrc}"/* $out
+      rm -r $out/examples
+      rm -r $out/tutorials
+    '';
+  deps = with depot.third_party; [
+    gopkgs."github.com".containerd.console
+    gopkgs."github.com".mattn.go-isatty
+    gopkgs."github.com".muesli.reflow.truncate
+    gopkgs."github.com".muesli.termenv
+    gopkgs."golang.org".x.sys.unix
+    gopkgs."golang.org".x.crypto.ssh.terminal
+  ];
+}