workflow: added docker login

.forgejo/workflows/push_tag.yaml

@@ -10,6 +10,12 @@ jobs:
     runs-on: docker
 
     steps:
+      - name: Login to Self Hosted Docker Registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.tigor.web.id
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
       - uses: actions/checkout@v4
       - run: echo "Building version ${{ github.ref_name }}"
       - run: docker build -t git.tigor.web.id/tigor/redmage:${{ github.ref_name }} -t git.tigor.web.id/tigor/redmage:latest .