fix(local-flake): Remove piper, rename mbt

# Issue

- `sap-piper` is not needed at the moment.
- `mbt` was cryptically named.

# Fix

- Remove `sap-piper`
- Rename `mbt` to the name of the repo

Author: silvestre

devbox.json

@@ -3,10 +3,7 @@
     "path:local-flake#bosh-bootloader":           "",
     "path:local-flake#app-autoscaler-cli-plugin": "",
     "path:local-flake#log-cache-cli-plugin":      "",
-    "path:local-flake#mbt":                       "",
-    "path:local-flake#sap-piper": {
-      "platforms": ["x86_64-linux"]
-    },
+    "path:local-flake#cloud-mta-build-tool":      "",
     "path:local-flake#uaac":                      "",
     "credhub-cli":                                "latest",
     "delve":                                      "latest",

local-flake/flake.nix

@@ -58,7 +58,7 @@
           ldflags = ["-s" "-w" "-X main.version=${version}"];
         };
 
-        mbt = nixpkgsFor.${system}.buildGoModule rec {
+        cloud-mta-build-tool = nixpkgsFor.${system}.buildGoModule rec {
           pname = "Cloud MTA Build Tool";
           version = "1.2.26";
 
@@ -82,30 +82,6 @@
           '';
         };
 
-        sap-piper = nixpkgsFor.${system}.buildGoModule rec {
-          pname = "Project Piper";
-          version = "1.360.0";
-
-          src = nixpkgsFor.${system}.fetchFromGitHub {
-            owner = "SAP";
-            repo = "jenkins-library";
-            rev = "v${version}";
-            hash = "sha256-eCg9fgP4pIhbW8zkg6izHb6V1VrkA+4hUCNvjMYOagI=";
-          };
-
-          vendorHash = "sha256-qCoz6jGoqGYsTYumrdy4RA3LdVwaMhS+vcCK2n970eg=";
-
-          ldflags = ["-s" "-w" "-X github.com/SAP/jenkins-library/cmd.GitTag=v${version}"];
-
-          doCheck = false;
-
-          postInstall = ''
-            pushd "$out/bin" &> /dev/null
-              ln -s 'jenkins-library' 'piper'
-            popd
-          '';
-        };
-
         uaac =  nixpkgsFor.${system}.bundlerApp rec {
           pname = "cf-uaac";
           gemdir = ./.;