add nix linter action

.gitea/workflows/analysis.yml

@@ -0,0 +1,13 @@
+on: [push]
+name: Lint Nix code
+jobs:
+  statix:
+    name: Lint code
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3.1.0
+      - uses: cachix/install-nix-action@v18
+      - uses: cachix/cachix-action@v12
+        with:
+          name: statix
+      - uses: https://github.com/jocelynthode/statix-action@master