ci: add publish-flakehub

.github/workflows/publish-quickgui.yml

@@ -91,3 +91,22 @@ jobs:
           exit 1
         fi
         gh release edit "${{ github.ref }}" --draft=false
+
+  publish-flakehub:
+    needs: [version-check]
+    name: "Publish FlakeHub ❄️"
+    runs-on: "ubuntu-22.04"
+    permissions:
+      id-token: "write"
+      contents: "read"
+    steps:
+      - uses: "actions/checkout@v4"
+        with:
+          ref: "${{ (inputs.tag != null) && format('refs/tags/{0}', inputs.tag) || '' }}"
+      - uses: "DeterminateSystems/nix-installer-action@v12"
+      - uses: "DeterminateSystems/magic-nix-cache-actionv7"
+      - uses: "DeterminateSystems/flakehub-push@v4"
+        with:
+          visibility: "public"
+          name: "quickemu-project/quickgui"
+          tag: "${{ inputs.tag }}"