add seo check workflow yaml

Author: Ph4t3

.github/workflows/seo-check.yaml

@@ -0,0 +1,17 @@
+name: "SEO Check"
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  seo-check:
+    runs-on: ubuntu-latest
+    container:
+      image: registry.opencode.de/open-code/document-writing-tools/seo-check:main-amd64
+    steps:
+      - uses: actions/checkout@v4
+      - name: Copy ISO data files into workspace
+        run: cp /seo-check/ISO-639-1-lang-codes.json /seo-check/ISO-3166-Alpha2-country-codes.csv .
+      - name: Run SEO-Check
+        run: bun run /seo-check/main.ts