Fix Nix FHS text fonts and fontconfig aliases (#113)

.github/workflows/source-check.yml

@@ -3,6 +3,12 @@ on: [push, pull_request]
 permissions:
   contents: read
 jobs:
+  nix-fonts:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@3c6342b75005b9cc7c7d4069c3e9179247c89012 # v31
+      - run: nix build .#checks.x86_64-linux.fonts --no-link -L
   validate:
     runs-on: ubuntu-latest
     steps: