Rinomina secret da GITEA_TOKEN a REGISTRY_TOKEN

- Aggiornati workflow docker-build.yml e docker-cleanup.yml
- Aggiornata guida SETUP_GITEA_TOKEN.md

.gitea/workflows/docker-build.yml

@@ -51,7 +51,7 @@ jobs:
         with:
           registry: gitea.home-nas-ds.org
           username: ${{ github.actor }}
-          password: ${{ secrets.GITEA_TOKEN }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
 
       - name: Build and push Docker image
         uses: docker/build-push-action@v4

.gitea/workflows/docker-cleanup.yml

@@ -23,7 +23,7 @@ jobs:
         with:
           registry: gitea.home-nas-ds.org
           username: ${{ github.actor }}
-          password: ${{ secrets.GITEA_TOKEN }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
 
       - name: Cleanup old development images
         run: |

SETUP_GITEA_TOKEN.md

@@ -27,7 +27,7 @@
    - Clicca su **Settings** (icona ingranaggio)
    - Nel menu laterale: **Secrets** → **Actions**
    - Clicca su **Add Secret**
-   - **Name:** `GITEA_TOKEN`
+   - **Name:** `REGISTRY_TOKEN`
    - **Value:** [incolla il token copiato]
    - Clicca su **Add Secret**