remove cachix usage

.gitea/workflows/deploy.yml

@@ -0,0 +1,15 @@
+on:
+  push:
+    branches:
+      - master
+      - test-deploy
+
+jobs:
+  build:
+    name: build hive configuration
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v31
+      - uses: http://github.com/nicknovitski/nix-develop@v1
+      - run: colmena apply