Correggi workflow Gitea Actions per usare registry self-hosted

- Modificato docker-build.yml per usare gitea.home-nas-ds.org invece di Docker Hub
- Modificato docker-cleanup.yml per autenticazione con registry Gitea
- Usato github.token automatico invece di secrets esterni
- Aggiornata documentazione per riflettere i cambiamenti

.gitea/workflows/docker-build.yml

@@ -34,7 +34,7 @@ jobs:
         uses: docker/metadata-action@v4
         with:
           images: |
-            ${{ secrets.DOCKER_USERNAME }}/ha-voltronic-mqtt
+            gitea.home-nas-ds.org/${{ github.repository }}
           tags: |
             type=ref,event=branch
             type=ref,event=pr
@@ -42,12 +42,13 @@ jobs:
             type=semver,pattern={{major}}.{{minor}}
             type=raw,value=latest,enable={{is_default_branch}}
 
-      - name: Login to Docker Hub
+      - name: Login to Gitea Container Registry
         if: github.event_name != 'pull_request'
         uses: docker/login-action@v2
         with:
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_PASSWORD }}
+          registry: gitea.home-nas-ds.org
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
 
       - name: Build and push Docker image
         uses: docker/build-push-action@v4

.gitea/workflows/docker-cleanup.yml

@@ -15,11 +15,12 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v3
 
-      - name: Login to Docker Hub
+      - name: Login to Gitea Container Registry
         uses: docker/login-action@v2
         with:
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_PASSWORD }}
+          registry: gitea.home-nas-ds.org
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
 
       - name: Cleanup old development images
         run: |