Parse Windows installer in CI

.github/workflows/ci.yml

@@ -76,6 +76,16 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
+      - name: PowerShell syntax check
+        shell: pwsh
+        run: |
+          $errors = $null
+          $tokens = $null
+          [System.Management.Automation.Language.Parser]::ParseFile("install.ps1", [ref]$tokens, [ref]$errors) | Out-Null
+          if ($errors.Count -gt 0) {
+            $errors | ForEach-Object { Write-Error $_ }
+            exit 1
+          }
       - name: Build Windows client
         run: cargo build --release --bin dosh-client --bin dosh-bench
       - name: Test Windows client

tests/release_scripts.rs

@@ -89,6 +89,13 @@ fn release_gates_test_all_targets() {
         .expect("windows-client job");
     assert!(windows_client.contains("runs-on: windows-latest"));
     assert!(windows_client.contains("name: Test Windows client"));
+    assert!(windows_client.contains("name: PowerShell syntax check"));
+    assert!(windows_client.contains("shell: pwsh"));
+    assert!(
+        windows_client
+            .contains("[System.Management.Automation.Language.Parser]::ParseFile(\"install.ps1\""),
+        "Windows CI must parse the installer with PowerShell"
+    );
     assert!(
         windows_client.contains("run: cargo test --all-targets"),
         "Windows CI must run Rust tests, not only build/package"