fix the manager

Dockerfile

@@ -11,10 +11,12 @@ RUN mkdir -p /app /defaults \
 RUN ln -snf /usr/share/zoneinfo/Europe/Rome /etc/localtime && \
     echo "Europe/Rome" > /etc/timezone
 
-# The base image may include Docker's apt repository, but this image does not
-# install Docker packages. Disable it so apt updates do not fail on stale keys.
+# The base image may include third-party apt repositories, but this image only
+# needs Debian packages. Disable inherited repos so stale keys cannot break apt.
 RUN rm -f /etc/apt/sources.list.d/docker.list \
-    /etc/apt/sources.list.d/download_docker_com_linux_debian.list
+    /etc/apt/sources.list.d/download_docker_com_linux_debian.list \
+    /etc/apt/sources.list.d/nodesource.list \
+    /etc/apt/sources.list.d/nodesource.list.save
 
 RUN apt-get update && \
         DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
@@ -37,7 +39,8 @@ RUN apt-get update && \
          && sed -i 's/# it_IT.UTF-8 UTF-8/it_IT.UTF-8 UTF-8/' /etc/locale.gen \
          && locale-gen it_IT.UTF-8 \
          && update-locale LANG=it_IT.UTF-8 LC_ALL=it_IT.UTF-8 \
-         && rm -rf /var/lib/apt/lists/*
+         && apt-get clean \
+         && rm -rf /var/lib/apt/lists/* /var/cache/apt/archives/*.deb
 
 
 # --- Install Microsoft core fonts (Arial, Times New Roman, Courier New, etc.) ---
@@ -46,8 +49,7 @@ RUN set -eux; \
     apt-get install -y --no-install-recommends \
       fontconfig \
       cabextract \
-      xfonts-utils \
-      gnupg; \
+      xfonts-utils; \
     \
     sed -i 's/ main$/ main contrib/g' /etc/apt/sources.list; \
     apt-get update; \
@@ -56,7 +58,8 @@ RUN set -eux; \
     DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends ttf-mscorefonts-installer; \
     \
     fc-cache -f -v; \
-    rm -rf /var/lib/apt/lists/*
+    apt-get clean; \
+    rm -rf /var/lib/apt/lists/* /var/cache/apt/archives/*.deb