Rename Linux universal release package/binary

Rename Linux universal release package from
`stockfish-ubuntu-x86-64-universal.tar.gz`  to
`stockfish-linux-x86-64-universal.tar.gz` (and similar for the binary), as the
bundled binary should run on any Linux distro with glibc >= 2.35 (which is the
glibc version of the Ubuntu 22.04 build server).

Note that the Linux universal binary is built with static libstdc++ linkage, so
this adds no extra dependency.

This change will hopefully make it less confusing for users, and in line with
how we show it on stockfishchess.org (as Linux).

closes https://github.com/official-stockfish/Stockfish/pull/6760

No functional change

.github/ci/universal_matrix.json

@@ -3,7 +3,7 @@
     {
       "name": "Ubuntu 22.04 GCC Universal",
       "os": "ubuntu-22.04",
-      "simple_name": "ubuntu",
+      "simple_name": "linux",
       "archive_ext": "tar.gz"
     },
     {

.github/workflows/compilation.yml

@@ -123,7 +123,7 @@ jobs:
         run: strip src/stockfish
 
       - name: Rename binary
-        run: mv src/stockfish stockfish-ubuntu-x86-64-universal
+        run: mv src/stockfish stockfish-linux-x86-64-universal
 
       - name: Extract the bench number from the commit history
         run: |
@@ -133,7 +133,7 @@ jobs:
           [[ -n "$benchref" ]] && echo "benchref=$benchref" >> $GITHUB_ENV && echo "From commit: $hash" && echo "Reference bench: $benchref" || echo "No bench found"
 
       - name: Check arch selection under SDE
-        run: ./scripts/check_universal.sh ./stockfish-ubuntu-x86-64-universal "$SDE_DIR/sde" "$benchref"
+        run: ./scripts/check_universal.sh ./stockfish-linux-x86-64-universal "$SDE_DIR/sde" "$benchref"
 
       - name: Remove non src files
         run: |
@@ -143,7 +143,7 @@ jobs:
       - name: Upload artifact for (pre)-release
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
-          name: ubuntu x86-64-universal
+          name: linux x86-64-universal
           path: |
              .
              !.git