ci: remove nix from gh workflows (#21572)

scripts/go-lint-all.bash

@@ -6,7 +6,7 @@ REPO_ROOT="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )/.." &> /dev/null && pwd
 export REPO_ROOT
 
 LINT_TAGS="e2e,ledger,test_ledger_mock"
-if [[ ! -z "${NIX:-}" ]]; then
+if [[ ! -z "${ROCKSDB:-}" ]]; then
   LINT_TAGS+=",rocksdb"
 fi
 export LINT_TAGS

scripts/go-mod-tidy-all.sh

@@ -6,20 +6,4 @@ for modfile in $(find . -name go.mod); do
  echo "Updating $modfile"
  DIR=$(dirname $modfile)
  (cd $DIR; go mod tidy)
-done
-
-# update gomod2nix.toml for simapp
-# NOTE: gomod2nix should be built using the same go version as the project, the nix flake will make sure of that
-# automatically.
-cd simapp
-if command -v nix &> /dev/null
-then
-    nix develop .. -c gomod2nix
-
-    if ! command -v gomod2nix &> /dev/null
-    then
-        echo "gomod2nix could not be found in PATH, installing..."
-        go install github.com/nix-community/gomod2nix@latest
-    fi
-    gomod2nix
-fi
+done