Fix Dockerfile: use keyring, install msodbcsql17

Dockerfile

@@ -1,22 +1,25 @@
 FROM python:3.11-slim
 ENV DEBIAN_FRONTEND=noninteractive
 
-# ODBC + Microsoft SQL Server ODBC driver 17 (matches your connection string)
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    curl gnupg2 apt-transport-https unixodbc unixodbc-dev \
- && curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
- && echo "deb [arch=amd64] https://packages.microsoft.com/debian/12/prod bookworm main" > /etc/apt/sources.list.d/mssql-release.list \
- && apt-get update && ACCEPT_EULA=Y apt-get install -y msodbcsql17 \
- && rm -rf /var/lib/apt/lists/*
+# System deps + Microsoft key via keyring (apt-key is deprecated/absent)
+RUN set -eux; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+        curl ca-certificates gnupg2 apt-transport-https \
+        unixodbc unixodbc-dev; \
+    mkdir -p /etc/apt/keyrings; \
+    curl -fsSL https://packages.microsoft.com/keys/microsoft.asc \
+      | gpg --dearmor -o /etc/apt/keyrings/microsoft.gpg; \
+    echo "deb [arch=amd64 signed-by=/etc/apt/keyrings/microsoft.gpg] https://packages.microsoft.com/debian/12/prod bookworm main" \
+      > /etc/apt/sources.list.d/mssql-release.list; \
+    apt-get update; \
+    ACCEPT_EULA=Y apt-get install -y msodbcsql17; \
+    rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
 COPY requirements.txt /app/
 RUN pip install --no-cache-dir -r requirements.txt
 COPY . /app
 
-# Spaces expect your server on port 7860
 EXPOSE 7860
-
-# Your Flask app object is `app` in verification.py
-# app.run() will NOT execute because gunicorn imports the module.
-CMD ["gunicorn", "--workers", "2", "--threads", "4", "--timeout", "120", "-b", "0.0.0.0:7860", "verification:app"]
+CMD ["gunicorn","--workers","2","--threads","4","--timeout","120","-b","0.0.0.0:7860","verification:app"]