shellcheck: fix lint of scripts in tests

test/nixos-search/ci-test.sh

@@ -6,15 +6,17 @@ cd "${BASH_SOURCE[0]%/*}"
 # Use cachix to cache the `flake-info` build
 cachixCache=nix-bitcoin
 
-nix run .#cachix -- use $cachixCache
+nix run .#cachix -- use "$cachixCache"
 
 # We're running in a basic, unprivileged container that doesn't support sandboxing.
 # Sandboxing is unnneeded because we're only building the 3rd-party `flake-info` tool.
 echo "sandbox = false" >> /etc/nix/nix.conf
-export PATH=$(nix shell -L .#flake-info .#cachix -c sh -c 'echo $PATH')
+
+# shellcheck disable=SC2016
+PATH=$(nix shell -L .#flake-info .#cachix -c sh -c 'echo $PATH')
 
 if [[ ${CACHIX_SIGNING_KEY:-} ]]; then
-    cachix push $cachixCache $(type -P flake-info);
+    cachix push "$cachixCache" "$(type -P flake-info)";
 fi
 
 echo "Running flake-info (nixos-search)"