debug(deploy): write helper diagnostics to host _debug.txt

scripts/deploy-via-docker.js

@@ -80,11 +80,17 @@ async function main() {
     Cmd: [
       'sh',
       '-c',
-      `set -e; ` +
-        `rm -rf ${HOST_STATIC}/front && ` +
-        `mkdir -p ${HOST_STATIC}/front && ` +
-        `cp -r ${SRC_IN_HELPER}/. ${HOST_STATIC}/front/ && ` +
-        `echo "copied"; ls -la ${HOST_STATIC}/front | head`,
+      // Write diagnostics to the host-mounted dir so we can inspect after the run.
+      `DBG=${HOST_STATIC}/_debug.txt; ` +
+        `echo "wsSource=${wsSource}" > $DBG; ` +
+        `echo "--- ls /src/front/dist/prod ---" >> $DBG; ` +
+        `ls -la ${SRC_IN_HELPER} >> $DBG 2>&1; ` +
+        `echo "src file count: $(find ${SRC_IN_HELPER} -type f 2>/dev/null | wc -l)" >> $DBG; ` +
+        `set -e; ` +
+        `rm -rf ${HOST_STATIC}/front && mkdir -p ${HOST_STATIC}/front && ` +
+        `cp -r ${SRC_IN_HELPER}/. ${HOST_STATIC}/front/ 2>> $DBG; ` +
+        `echo "dest file count: $(find ${HOST_STATIC}/front -type f 2>/dev/null | wc -l)" >> $DBG; ` +
+        `echo "copied"`,
     ],
   };