set branch to run on puch

.gitea/workflows/analysis.yml

@@ -1,7 +1,4 @@
-on:
-  pull_request:
-  push:
-    branches: [main]
+on: [push]
 
 jobs:
   build:
@@ -11,3 +8,7 @@ jobs:
       - uses: actions/checkout@v3
       - name: Check Nix flake inputs
         uses: DeterminateSystems/flake-checker-action@main # This action
+      - name: Install Nix
+        uses: DeterminateSystems/determinate-nix-action@v3
+      - name: Build default package
+        run: nix build