Update Dockerfile

Dockerfile

@@ -4,12 +4,13 @@ FROM python:3.9-slim
 # Set the working directory inside the container
 WORKDIR /app
 
-# CRITICAL FIX: The wkhtmltox package requires libssl1.1, which is not in the new Debian repos.
-# We must manually add the repository for the older Debian "Buster" release to find this package.
-RUN echo "deb http://deb.debian.org/debian buster main" >> /etc/apt/sources.list
+# --- THE CORRECT FIX ---
+# 1. The Debian 10 "Buster" repository is now on the archive server. We must point to the correct URL.
+# 2. We add "[trusted=yes]" because archived repositories may have expired GPG keys.
+RUN echo "deb [trusted=yes] http://archive.debian.org/debian buster main" > /etc/apt/sources.list.d/buster.list
 
-# Update the package lists to include the newly added "Buster" repository.
-# Then, install all necessary dependencies. apt will now be able to find libssl1.1.
+# Now, update the package lists. This will successfully find the old packages on the archive server.
+# Then, install all the necessary system libraries, which will now be found.
 RUN apt-get update && apt-get install -y --no-install-recommends \
     wget \
     fontconfig \
@@ -18,12 +19,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     xfonts-75dpi \
     xfonts-base \
     libxrender1 \
-    # This will now succeed because we added the buster repo
     libssl1.1 \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
-# Now that all dependencies are present, download and install the wkhtmltox package.
+# With all dependencies correctly installed, download and install the wkhtmltox package.
 RUN wget https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6-1/wkhtmltox_0.12.6-1.buster_amd64.deb && \
     dpkg -i wkhtmltox_0.12.6-1.buster_amd64.deb && \
     rm wkhtmltox_0.12.6-1.buster_amd64.deb