Patch up to use a published patched meshcore-decoder and add a test script for different node versions

scripts/docker_ci.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+NC='\033[0m'
+
+SCRIPT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+
+NODE_VERSIONS=("20" "22" "24")
+NPM_VERSIONS=("9" "10")
+
+echo -e "${YELLOW}=== Frontend Docker CI Matrix ===${NC}"
+echo -e "${BLUE}Repo:${NC} $SCRIPT_DIR"
+echo
+
+run_combo() {
+    local node_version="$1"
+    local npm_version="$2"
+    local image="node:${node_version}-slim"
+
+    echo -e "${YELLOW}=== Node ${node_version} / npm ${npm_version} ===${NC}"
+
+    docker run --rm \
+        -v "$SCRIPT_DIR:/src:ro" \
+        -w /tmp \
+        "$image" \
+        bash -lc "
+            set -euo pipefail
+            cp -a /src/frontend ./frontend
+            cd frontend
+            npm i -g npm@${npm_version}
+            echo 'Using Node:' \$(node -v)
+            echo 'Using npm:' \$(npm -v)
+            npm install
+            npm run build
+        "
+
+    echo -e "${GREEN}Passed:${NC} Node ${node_version} / npm ${npm_version}"
+    echo
+}
+
+for node_version in "${NODE_VERSIONS[@]}"; do
+    for npm_version in "${NPM_VERSIONS[@]}"; do
+        run_combo "$node_version" "$npm_version"
+    done
+done
+
+echo -e "${GREEN}=== Docker CI matrix passed ===${NC}"