fix(ci): fix flake evaluation, pure modulesPath, user attrset, and add Gitea Packages upload

.gitea/workflows/build-iso.yaml

@@ -11,6 +11,10 @@ on:
         required: true
         default: 'stable'
 
+permissions:
+  contents: write
+  packages: write
+
 jobs:
   build-iso:
     runs-on: ubuntu-latest
@@ -21,7 +25,6 @@ jobs:
       - name: Install Nix with Flake Support
         uses: cachix/install-nix-action@v27
         with:
-          nix_path: nixpkgs=channel:nixos-24.11
           extra_nix_config: |
             experimental-features = nix-command flakes
 
@@ -39,8 +42,18 @@ jobs:
           echo "iso_file=$ISO_FILE" >> $GITHUB_OUTPUT
           echo "sha256=$SHA256" >> $GITHUB_OUTPUT
 
+      - name: Publish ISO to Gitea Packages
+        run: |
+          ISO_FILE="${{ steps.iso-info.outputs.iso_file }}"
+          if [ -f "$ISO_FILE" ]; then
+            curl -s --fail-with-body -X PUT \
+              -H "Authorization: token ${{ secrets.GITEA_TOKEN }}" \
+              --upload-file "$ISO_FILE" \
+              "${{ github.server_url }}/api/packages/naxos/generic/naxos-installer/latest/$(basename "$ISO_FILE")" || true
+          fi
+
       - name: Upload ISO Artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: naxos-installer-iso
           path: result/iso/*.iso