fixup! randomly pick a builder and pass it as --store

buildbot_nix/__init__.py

@@ -66,10 +66,10 @@ class NixBuilder:
         fullConnection = f"{self.protocol}://{fullConnection}"
         params = []
         if self.sshKey is not None:
-            params += f"ssh-key={self.sshKey}"
+            params.append(f"ssh-key={self.sshKey}")
         if self.publicHostKey is not None:
             encoded_public_key = base64.b64encode(self.publicHostKey.encode('ascii')).decode('ascii')
-            params += f"base64-ssh-public-host-key={encoded_public_key}"
+            params.append(f"base64-ssh-public-host-key={encoded_public_key}")
         if params != []:
             fullConnection += "?"
             fullConnection += "&".join(params)

nix/worker.nix

@@ -62,6 +62,7 @@ in
         pkgs.openssh
         pkgs.nix
         pkgs.nix-eval-jobs
+        pkgs.bash
       ];
       environment.PYTHONPATH = "${python.withPackages (_: [cfg.package])}/${python.sitePackages}";
       environment.MASTER_URL = cfg.coordinatorUrl;