CI: Add support for validation on non-dortania repos

.github/workflows/validate-external.yml

@@ -0,0 +1,23 @@
+name: CI - Validation (External)
+
+on:
+  push:
+  workflow_dispatch:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    name: Validate
+    runs-on: macos-latest
+    if: github.repository_owner != 'dortania'
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.10'
+      - name: Install Dependencies
+        run: python3 -m pip install -r requirements.txt
+      - name: Validate
+        run: python3 OpenCore-Patcher-GUI.command --validate

.github/workflows/validate.yml

@@ -10,6 +10,7 @@ jobs:
   build:
     name: Validate
     runs-on: x86_64_monterey
+    if: github.repository_owner == 'dortania'
     steps:
       - uses: actions/checkout@v3
       - name: Validate