chore: add Docker configuration and Gitea CI/CD workflow

.gitea/workflows/docker-build.yml

@@ -14,7 +14,7 @@ on:
 
 env:
   REGISTRY: code.littlelan.cn
-  IMAGE_NAME: ${{ tolower(github.repository_owner) }}/carrotskin
+  IMAGE_NAME: carrotskin/carrotskin
 
 jobs:
   build-and-push:
@@ -32,8 +32,8 @@ jobs:
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
-          username: ${{ secrets.GIT_USERNAME }}
-          password: ${{ secrets.GIT_TOKEN }}
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
 
       - name: Extract metadata for Docker
         id: meta