[ci] install liburing for the site build

The v1.0.0-RC6 site deploy failed linking the browser bundle:

    /usr/bin/ld: cannot find -luring: No such file or directory
    [error] (kyo-netJS / ffiCompile) C compilation failed (exit=1)

The bundle reaches kyo-net through kyo-http, so linking it compiles
kyo-net's io_uring shim, which statically links -luring. deploy-site.yml
does not use .github/actions/setup and so never installed it. Before RC6
the site build pulled in no native shim and the gap did not show.

Installs liburing-dev inline, the way readme.yml already does for the
same reason. BoringSSL is not staged: build.sbt falls back to the
c-boringssl-stub shim, which is all a docs render needs, and readme.yml
sets the same precedent.

Author: fwbrasil

.github/workflows/deploy-site.yml

@@ -40,6 +40,13 @@ jobs:
         with:
           jvm: corretto:25
           apps: sbt
+      # liburing (build-time only): the site bundle reaches kyo-net through kyo-http, and linking it
+      # compiles kyo-net's io_uring FFI shim (kyo_uring.c), which statically links -luring. This
+      # workflow does not use .github/actions/setup, so install it here too, as readme.yml does.
+      # BoringSSL is not staged: build.sbt falls back to the c-boringssl-stub shim, which is all a
+      # docs render needs.
+      - name: Install liburing (Linux)
+        run: bash scripts/apt-install.sh liburing-dev
       - name: Link the browser bundle (fullLinkJS)
         run: sbt 'kyo-website-bundleJS/Compile/fullLinkJS'
       - name: Render and assemble the site from the current repo