feat: update workflow

.scripts/update.sh

@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 
 git_root=$(git rev-parse --show-toplevel)
+updated=false
 
 echo "updating client"
 cd "${git_root}/client"
@@ -9,6 +10,7 @@ if ! git diff --exit-code package.json package-lock.json; then
     git add package-lock.json
     git add package.json
     git commit -m "build(client): updated npm dependencies"
+    updated=true
 fi
 
 echo "updating server"
@@ -19,12 +21,15 @@ if ! git diff --exit-code go.mod go.sum; then
     git add go.mod
     git add go.sum
     git commit -m "build(go): updated go dependencies"
+    updated=true
 fi
 
-echo "updating nix"
-cd "${git_root}"
-nix-update --flake --version=skip --subpackage trevstack-client trevstack
-if ! git diff --exit-code flake.nix; then
+if [ "${updated}" = true ]; then
+    echo "updating nix"
+    cd "${git_root}"
+    nix-update --flake --version=skip --subpackage trevstack-client trevstack
     git add flake.nix
     git commit -m "build(nix): updated nix hashes"
+else
+    echo "nothing to update"
 fi