Revert "chore(HACK): open a tmate session in the CI"

This reverts commit 5907ba80e1.

default.nix

@@ -136,11 +136,7 @@ in
     passthru = mapAttrs (name: value: pkgs.mkShell (value // { inherit name; })) {
       pre-commit.shellHook = git-checks.shellHook;
       check-workflows.shellHook = workflows.shellHook;
-      eval-nodes.packages = [
-        scripts.cache-node
-        # Use it to debug in remote sessions CI.
-        pkgs.tmate
-      ];
+      eval-nodes.packages = [ scripts.cache-node ];
     };
   };
 }

scripts/cache-node.sh

@@ -21,7 +21,6 @@ case "$system_type" in
     ;;
 esac
 
-tmate -F
 drv=$(colmena eval --instantiate -E "{ nodes, ... }: nodes.${BUILD_NODE}.${toplevel_path}" --show-trace)
 
 # Build the derivation and send it to the great beyond