test: re-introduce flake checks for 15 and 16

Author: samrose

docker/nix/build_nix.sh

@@ -5,11 +5,9 @@ nix --version
 if [ -d "/workspace" ]; then
     cd /workspace
 fi
-if [ "$(uname -sm)" != "Darwin arm64" ]; then
-    echo "Running on non-macOS arm64 and amd64, remove me when pg_net supports darwin arm64" 
-    nix build .#checks.$(nix-instantiate --eval -E builtins.currentSystem | tr -d '"').psql_15 -L --no-link
-    nix build .#checks.$(nix-instantiate --eval -E builtins.currentSystem | tr -d '"').psql_16 -L --no-link
-fi
+echo "Running on non-macOS arm64 and amd64, remove me when pg_net supports darwin arm64" 
+nix build .#checks.$(nix-instantiate --eval -E builtins.currentSystem | tr -d '"').psql_15 -L --no-link
+nix build .#checks.$(nix-instantiate --eval -E builtins.currentSystem | tr -d '"').psql_16 -L --no-link
 #no nix flake check on oriole yet
 nix build .#psql_15/bin -o psql_15
 nix build .#psql_16/bin -o psql_16