the “check already built” script does not work for flakes

.github/workflows/build.yml

@@ -46,14 +46,6 @@ jobs:
         run: sudo apt install jq
       - name: Build ${{ matrix.host }}
         run: |
-          DRV_PATH=$(nix-instantiate -E '((builtins.getFlake github:ursi/get-flake) ./.).hydraJobs.${{ matrix.host }}')
-          OUT_PATH=$(nix show-derivation $DRV_PATH | jq -r ".\"$DRV_PATH\".outputs.out.path")
-          # check if we already built it
-          NARINFO=$(echo $OUT_PATH | sed 's|/| |g' | sed 's|-| |g' | awk '{print $3}')
-          if curl --output /dev/null --silent --head --fail "https://cache.chir.rs/$NARINFO.narinfo"; then
-            echo "${{ matrix.host }} already built. Skipping"
-          else
-            nix-store -r $DRV_PATH
-          fi
+          nix build '.#hydraJobs.${{ matrix.host }}'
         env:
           NIXPKGS_ALLOW_UNFREE: 1