fix iso generation in gite actions

.gitea/workflows/iso-builder.yml

@@ -40,29 +40,40 @@ jobs:
             download-buffer-size = 200000000
             auto-optimise-store = true
 
-      - name: Build ${{ matrix.host }} ISO
+      - name: Build ${{ matrix.host }} ISO (nixos-generators)
         run: |
-          nix build \
-            .#nixosConfigurations.${{ matrix.host }}-iso.config.system.build.isoImage \
-            --print-build-logs \
-            --out-link iso-result
+          nix run github:nix-community/nixos-generators -- \
+            -f iso \
+            --flake .#${{ matrix.host }}-iso \
+            -o iso-result
 
       - name: Show ${{ matrix.host }} ISO info
         run: |
+          ISO_SRC=$(find iso-result -name '*.iso' -type f | head -n 1)
+          if [ -z "$ISO_SRC" ]; then
+            echo "No ISO found under iso-result"
+            find iso-result -maxdepth 3 -type f
+            exit 1
+          fi
           echo "ISO built successfully:"
-          ls -lh iso-result/iso/
+          ls -lh "$ISO_SRC"
           echo ""
           echo "SHA256:"
-          sha256sum iso-result/iso/*.iso
+          sha256sum "$ISO_SRC"
 
       - name: Prepare ${{ matrix.host }} ISO artifact (split if needed)
         run: |
           set -euo pipefail
           mkdir -p iso-result/artifact
-          ISO_SRC=$(ls iso-result/iso/*.iso)
+          ISO_SRC=$(find iso-result -name '*.iso' -type f | head -n 1)
+          if [ -z "$ISO_SRC" ]; then
+            echo "No ISO found under iso-result"
+            find iso-result -maxdepth 3 -type f
+            exit 1
+          fi
           ISO_BASENAME="${{ matrix.host }}-installer.iso"
           ISO_DEST="iso-result/artifact/${ISO_BASENAME}"
-          mv "$ISO_SRC" "$ISO_DEST"
+          cp "$ISO_SRC" "$ISO_DEST"
 
           SIZE=$(stat -c%s "$ISO_DEST")
           if [ "$SIZE" -gt 240000000 ]; then
@@ -71,18 +82,18 @@ jobs:
             sha256sum "$ISO_DEST" > "${ISO_DEST}.sha256"
             rm "$ISO_DEST"
             cat > "iso-result/artifact/README.txt" <<EOF
-Reassemble:
-  cat ${ISO_BASENAME}.part-* > ${ISO_BASENAME}
-Verify:
-  sha256sum -c ${ISO_BASENAME}.sha256
-EOF
-          else
-            sha256sum "$ISO_DEST" > "${ISO_DEST}.sha256"
-          fi
-
-      - name: Upload ${{ matrix.host }} ISO artifact
-        if: ${{ github.event_name != 'workflow_dispatch' || inputs.upload-artifact }}
-        uses: actions/upload-artifact@v3
-        with:
-          name: ${{ matrix.host }}-installer-iso
-          path: iso-result/artifact/**
+          Reassemble:
+            cat ${ISO_BASENAME}.part-* > ${ISO_BASENAME}
+          Verify:
+            sha256sum -c ${ISO_BASENAME}.sha256
+          EOF
+                    else
+                      sha256sum "$ISO_DEST" > "${ISO_DEST}.sha256"
+                    fi
+          
+                - name: Upload ${{ matrix.host }} ISO artifact
+                  if: ${{ github.event_name != 'workflow_dispatch' || inputs.upload-artifact }}
+                  uses: actions/upload-artifact@v3
+                  with:
+                    name: ${{ matrix.host }}-installer-iso
+                    path: iso-result/artifact/**