ci(release): use rtx instead of nix

.cirrus.yml

@@ -2,9 +2,21 @@ task:
   name: Build
   macos_instance:
     image: ghcr.io/cirruslabs/macos-ventura-base:latest
-  build_script:
-    - curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install --no-confirm
-    - . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
-    - nix build .#ci
+  release_script:
+    - chmod +x "$PWD/bin/7z"
+    - brew install 7zip
+    - mkdir -p "$HOME/bin"
+    - curl https://rtx.pub/rtx-latest-macos-arm64 > "$HOME/bin/rtx"
+    - chmod +x "$HOME/bin/rtx"
+    - echo "PATH=$HOME/bin:$PATH" >> $CIRRUS_ENV
+    - echo "RTX_TRUSTED_CONFIG_PATHS="$PWD/.rtx.toml"
+    - echo "RTX_YES="yes"
+    - export PATH=$HOME/bin:$PATH
+    - rtx install
+    - for path in $(rtx bin-paths); do export PATH="$path:$PATH"; done
+    - mix local.hex --force
+    - mix local.rebar --force
+    - mix deps.get
+    - PATH="$PWD/bin:$PATH" MIX_ENV=prod mix release
   binary_artifacts:
-    path: result/burrito_out/*
+    path: burrito_out/*