fix nix build

.forgejo/workflows/build-nix.yml

@@ -0,0 +1,13 @@
+name: "Build legacy Nix package on Ubuntu"
+
+on:
+  push:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: cachix/install-nix-action@v26
+      - name: Building package
+        run: nix build 

.forgejo/workflows/build-rust.yml

@@ -1,13 +0,0 @@
----
-name: Rust
-
-on:
-  push:
-    branches: [main]
-    tags: ['*']
-  pull_request:
-
-jobs:
-  build:
-    uses: https://github.com/famedly/github-workflows/.github/workflows/rust.yml@main
-    secrets: inherit