Set up container image for Docker-based CI workflow

Added a container image definition to use ghcr.io/catthehacker/ubuntu:act-latest in the build-and-push job. This enhances compatibility when running the workflow locally with act and ensures consistency in the execution environment. Corrected spacing in the secrets configuration for better code formatting.

.gitea/workflows/docker-build.yml

@@ -9,7 +9,8 @@ on:
 jobs:
   build-and-push:
     runs-on: docker
-
+    container:
+      image: ghcr.io/catthehacker/ubuntu:act-latest
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v4
@@ -21,7 +22,7 @@ jobs:
         uses: docker/login-action@v3
         with:
           registry: gitea.pragmazest.com
-          username: ${{ secrets.DOCKER_REGISTRY_USERNAME }}
+          username: ${{ secrets.DOCKER_REGISTRY_USERNAME  }}
           password: ${{ secrets.DOCKER_REGISTRY_ACCESS_TOKEN }}
 
       - name: Extract metadata