chore: migrate from blacksmith to fully use self-hosted workers

.github/workflows/pr-check.yml

@@ -6,7 +6,7 @@ on:
 
 jobs:
   lint-and-build:
-    runs-on: blacksmith-2vcpu-ubuntu-2404
+    runs-on: self-hosted
 
     env:
       NODE_OPTIONS: "--max-old-space-size=4096"
@@ -19,6 +19,7 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version-file: ".nvmrc"
+          cache: "npm"
 
       - name: Install dependencies
         run: npm ci