Limit concurrent NativeAOT compiles to stop MSBuild nodes dying of memory pressure [CI]

ci/release-linux.sh

@@ -91,9 +91,9 @@ mkdir -p "$sqlite_cache_root/locks"
 # an idle node-reuse worker can inherit it and block later pipelines indefinitely.
 (
   cd "$root/backend"
-  flock --close --wait 900 "$sqlite_cache_root/locks/$rid.lock" \
+  bash "$root/ci/with-aot-slot.sh" flock --close --wait 900 "$sqlite_cache_root/locks/$rid.lock" \
     dotnet publish src/MoShiro.Backend \
-      -m:8 -c Release -r "$rid" --self-contained true \
+      -m:4 -nodeReuse:false -c Release -r "$rid" --self-contained true \
       --no-restore \
       -p:DebugType=none -p:DebugSymbols=false \
       -p:PublishAot=true -p:UseAotAnywhere=true -p:SqliteStaticLink=true -p:OpenApiGenerateDocuments=false \