Tools: add WebAssembly SITL support

Tools/environment_install/install-wasm-prereqs-ubuntu.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -e
+set -x
+
+EMSCRIPTEN_VERSION=${EMSCRIPTEN_VERSION:-6.0.8}
+EMSDK_ROOT=${EMSDK_ROOT:-$HOME/emsdk}
+SHELL_LOGIN=${SHELL_LOGIN:-.profile}
+
+if ! python3 -c 'import sys; sys.exit(sys.version_info < (3, 10))'; then
+    echo "Emscripten SDK requires Python 3.10 or newer."
+    exit 1
+fi
+
+if [ ! -d "$EMSDK_ROOT/.git" ]; then
+    git clone https://github.com/emscripten-core/emsdk.git "$EMSDK_ROOT"
+else
+    if ! git -C "$EMSDK_ROOT" pull --ff-only; then
+        echo "Warning: could not update emsdk; continuing with the existing checkout." >&2
+    fi
+fi
+
+"$EMSDK_ROOT/emsdk" install "$EMSCRIPTEN_VERSION"
+"$EMSDK_ROOT/emsdk" activate "$EMSCRIPTEN_VERSION"
+
+exportline_wasm=". \"$EMSDK_ROOT/emsdk_env.sh\" >/dev/null"
+grep -Fxq "$exportline_wasm" "$HOME/$SHELL_LOGIN" 2>/dev/null || echo "$exportline_wasm" >> "$HOME/$SHELL_LOGIN"
+eval "$exportline_wasm"

Tools/scripts/test_new_boards.py

@@ -312,6 +312,11 @@ class TestNewBoards(BuildScriptBase):
                 self.progress(f"Skipping arm-linux board {board.name}")
                 continue
 
+            # Skip Emscripten boards - CI machine doesn't have the SDK
+            if board.toolchain == "emscripten":
+                self.progress(f"Skipping Emscripten board {board.name}")
+                continue
+
             self.progress(f"Building board {board.name}")
             if boards_to_test[board_name].test_vehicles:
                 self.build_board(board)