ci - 폐쇄망 액션 경로 사내 Gitea로 변경

- actions/checkout, upload-artifact를
  http://172.30.1.50:3000/actions 로 교체
- github.com 접근 불가로 빌드 실패 해결

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/eapim-portal-ci.yml

@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout eapim-portal (trigger SHA)
-        uses: actions/checkout@v4
+        uses: http://172.30.1.50:3000/actions/checkout@v4
         with:
           path: eapim-portal
 
@@ -52,7 +52,7 @@ jobs:
         run: gradle clean build -x test --no-daemon
 
       - name: Upload WAR artifacts
-        uses: actions/upload-artifact@v3
+        uses: http://172.30.1.50:3000/actions/upload-artifact@v3
         with:
           name: eapim-portal-wars-${{ github.sha }}
           path: |