ci: fix expressions using secrets.* in if by moving to env-based guard; add Windows-safe key injection

.github/workflows/desktop-release.yml

@@ -13,6 +13,8 @@ jobs:
   build:
     name: Build ${{ matrix.platform }}
     runs-on: ${{ matrix.runner }}
+    env:
+      TAURI_PUBLIC_KEY: ${{ secrets.TAURI_PUBLIC_KEY }}
     strategy:
       fail-fast: false
       matrix:
@@ -50,14 +52,19 @@ jobs:
       - name: Install pnpm deps
         run: pnpm -C apps/desktop install --frozen-lockfile
 
-      - name: Inject Tauri public key
-        if: ${{ secrets.TAURI_PUBLIC_KEY != '' }}
-        env:
-          TAURI_PUBLIC_KEY: ${{ secrets.TAURI_PUBLIC_KEY }}
+      - name: Inject Tauri public key (Linux/macOS)
+        if: ${{ env.TAURI_PUBLIC_KEY != '' && matrix.platform != 'windows' }}
         run: |
           set -euo pipefail
           sed -i "s/REPLACE_WITH_TAURI_PUBLIC_KEY/${TAURI_PUBLIC_KEY//\//\\\/}/" apps/desktop/src-tauri/tauri.conf.json
 
+      - name: Inject Tauri public key (Windows)
+        if: ${{ env.TAURI_PUBLIC_KEY != '' && matrix.platform == 'windows' }}
+        shell: pwsh
+        run: |
+          $p = 'apps/desktop/src-tauri/tauri.conf.json'
+          (Get-Content $p) -replace 'REPLACE_WITH_TAURI_PUBLIC_KEY', $env:TAURI_PUBLIC_KEY | Set-Content $p
+
       - name: Build desktop
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}