add caching and flake-checker to repo

.gitea/workflows/analysis.yml

@@ -1,13 +1,14 @@
 on: [push]
-name: Lint Nix code
+
 jobs:
-  statix:
-    name: Lint code
-    runs-on: ubuntu-latest
+  build:
+    name: Build Nix targets
+    runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v3.1.0
-      - uses: cachix/install-nix-action@v18
-      - uses: cachix/cachix-action@v12
+      - uses: actions/checkout@v4
+      - uses: http://github.com/cachix/install-nix-action@v18
+      - uses: http://github.com/cachix/cachix-action@v12
         with:
           name: statix
-      - uses: https://github.com/jocelynthode/statix-action@master
+      - name: Check Nix flake inputs
+        uses: http://github.com/DeterminateSystems/flake-checker-action@main