this derivation will be built:
  /nix/store/dkwj6zf720n6p3cq6knjgshi0l0pq1q7-iets-nextest-0.1.0.drv
error: Cannot build '/nix/store/dkwj6zf720n6p3cq6knjgshi0l0pq1q7-iets-nextest-0.1.0.drv'.
       Reason: builder failed with exit code 100.
       Output paths:
         /nix/store/q8gbvb17ghlrlkzxds1zpvvvmawlwzgd-iets-nextest-0.1.0
       Last 25 log lines:
       >         FAIL [   0.173s] (1/1) iets::nixpkgs_eval nixpkgs_drvs_match_nix
       >   stdout ---
       >
       >     running 1 test
       >     test nixpkgs_drvs_match_nix ... FAILED
       >
       >     failures:
       >
       >     failures:
       >         nixpkgs_drvs_match_nix
       >
       >     test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.16s
       >     
       >   stderr ---
       >
       >     thread 'nixpkgs_drvs_match_nix' (1146) panicked at tests/nixpkgs_eval.rs:27:5:
       >     env -u NIX_CONFIG NIX_CONF_DIR="/nonexistent" NIX_USER_CONF_FILES="" "/nix/store/7vpxiq5ilyp8i789xr82q4jdg2wy4hca-nix-eval-jobs-2.35.4/bin/nix-eval-jobs" "--store" "dummy://?read-only=false" "--impure" "--no-instantiate" "--workers" "4" "--arg" "nixpkgs" "/nix/store/61zfbhpgh5k6a8708l6mcap1kjbs3mz7-r5l65vg4gi4dnx54zkwagfb8jmlqniy5-source" "--arg" "limit" "null" "/build/source/tests/nixpkgs_eval.nix": error: creating directory "/homeless-shelter/.cache/nix": Permission denied
       >
       >     note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
       >
       >   Cancelling due to test failure:
       > ------------
       >      Summary [   0.195s] 1 test run: 0 passed, 1 failed, 0 skipped
       >         FAIL [   0.173s] (1/1) iets::nixpkgs_eval nixpkgs_drvs_match_nix
       > error: test run failed
       For full logs, run:
         nix log /nix/store/dkwj6zf720n6p3cq6knjgshi0l0pq1q7-iets-nextest-0.1.0.drv