Restrict some GH actions to not run on forks

Author: marekdedic

.github/workflows/GHPages.yml

@@ -18,6 +18,7 @@ concurrency:
 
 jobs:
   deploy:
+    if: github.repository == 'sveltejs/eslint-plugin-svelte'
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}

.github/workflows/pkg.pr.new.yml

@@ -8,6 +8,7 @@ on:
 
 jobs:
   build:
+    if: github.repository == 'sveltejs/eslint-plugin-svelte'
     runs-on: ubuntu-latest
 
     steps: