ci: lets attempt dynamic registry url

.gitea/workflows/server.yaml

@@ -96,7 +96,7 @@ jobs:
       - name: Login to Docker Hub
         uses: docker/login-action@v3
         with:
-          registry: forge.rainote.dev
+          registry: ${{ github.server_url }}
           username: ${{ secrets.REGISTRY_USERNAME }}
           password: ${{ secrets.REGISTRY_TOKEN }}
       - name: Build and push
@@ -105,7 +105,7 @@ jobs:
           context: .
           file: Server/Dockerfile
           push: true
-          tags: forge.rainote.dev/Wonderking/Continuity:latest,forge.rainote.dev/Wonderking/Continuity:${{ github.ref_name }}
+          tags: ${{ github.server_url }}/${{ github.repository }}:latest,${{ github.server_url }}/${{ github.repository }}:${{ github.ref_name }}
           platforms: linux/amd64
   dependency-track-container:
     needs: build-push-server-container