Add proper nix expression

Author: PruStephan

.buildkite/pipeline-for-tags.yml

@@ -91,7 +91,7 @@ steps:
    soft_fail: true # No artifacts to download if all the bottles are already built
    commands:
    - mkdir -p "Big Sur"
-   - gh release download build.tag -D "Big Sur/" -p "*.bottle.tar.gz"
+   - nix develop .#buildkite -c gh release download $(git describe --tag) -D "Big Sur/" -p "*.bottle.tar.gz"
    - ls "Big Sur"
 
  - label: delete test-release pre-release

tezos_vote.log

@@ -0,0 +1 @@
+Command '['sudo', '-u', 'tezos', 'mkdir', '-p', '/var/lib/tezos/client-mainnet']' returned non-zero exit status 1.