Merge pull request 'push to cachix if build succeeds' (#4) from cachix-push into main

Reviewed-on: #4

.forgejo/workflows/build.yml

@@ -42,4 +42,9 @@ jobs:
             --fallback \
             -v \
             --log-format raw \
-             > >(tee stdout.log) 2> >(tee /tmp/nix-build-err.log >&2)
+             > >(tee stdout.log) 2> >(tee /tmp/nix-build-err.log >&2)
+      - name: Push to Cachix
+        if: success()
+        env:
+          CACHIX_AUTH_TOKEN: ${{ secrets.CACHIX_AUTH_TOKEN }}
+        run: nix build ".#top.${{ matrix.system }}" --json | jq -r .[].drvPath | cachix push hsndev