ci: add Gitea/Forgejo CI workflow for automated documentation hosting

.forgejo/workflows/deploy-docs.yml

@@ -0,0 +1,42 @@
+name: Deploy Documentation
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build-and-deploy:
+    runs-on: docker  # gitea-pages 스택의 runner 가 docker 라벨로 등록됨
+    container:
+      image: python:3.11-bookworm
+    steps:
+      - name: 저장소 체크아웃
+        uses: actions/checkout@v4
+
+      - name: Install System Dependencies (Graphviz for FORD)
+        run: |
+          apt-get update
+          apt-get install -y graphviz
+
+      - name: Install Python Requirements & Compile Docs
+        run: |
+          pip install -r requirements.txt
+          python3 build_docs.py
+
+      - name: gh-pages 브랜치로 site/ 배포
+        env:
+          # Forgejo Actions 가 자동 주입 — 추가 secret 등록 불필요
+          DEPLOY_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          REPO: ${{ github.repository }}
+          ACTOR: ${{ github.actor }}
+        run: |
+          cd site
+          git init -b master
+          git config user.name "Forgejo Actions Bot"
+          git config user.email "actions@1gnis-git.duckdns.org"
+          git add .
+          git commit -m "Auto-deploy Docs (${GITHUB_SHA::8})"
+          git push --force \
+            "https://${ACTOR}:${DEPLOY_TOKEN}@1gnis-git.duckdns.org/${REPO}.git" \
+            master:gh-pages