ci: various fixes

- adjust reviewers
- add workflow as cache key
- install attr only when tesitng
- fix s390x workflow by checking out the merge PR instead of master

.github/scripts/install_deps.sh

@@ -12,7 +12,7 @@ done
 os=$(uname -s)
 if [[ $os == Linux ]]; then
   sudo apt-get update
-  sudo apt-get install -y attr build-essential cmake curl gettext libattr1-dev ninja-build unzip
+  sudo apt-get install -y build-essential cmake curl gettext ninja-build unzip
 
   if [[ $CC == clang ]]; then
     DEFAULT_CLANG_VERSION=$(echo |  clang -dM -E - | grep __clang_major | awk '{print $3}')
@@ -30,7 +30,7 @@ if [[ $os == Linux ]]; then
   fi
 
   if [[ -n $TEST ]]; then
-    sudo apt-get install -y locales-all cpanminus
+    sudo apt-get install -y locales-all cpanminus attr libattr1-dev
   fi
 elif [[ $os == Darwin ]]; then
   brew update --quiet

.github/scripts/reviews.js

@@ -60,7 +60,7 @@ module.exports = async ({ github, context }) => {
 
   if (labels.includes("lsp")) {
     reviewers.add("folke");
-    reviewers.add("glepnir");
+    reviewers.add("MariaSolOs");
     reviewers.add("mfussenegger");
   }