Fix missing libgssapi-krb5-2 dependency in Docker image

The ODBC driver failed to load at runtime because libgssapi_krb5.so.2
was not installed. Add it explicitly to the apt-get install step.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -10,7 +10,7 @@ RUN apt-get update \
     && curl -fsSL https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor -o /usr/share/keyrings/microsoft-prod.gpg \
     && echo "deb [arch=amd64 signed-by=/usr/share/keyrings/microsoft-prod.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 --no-install-recommends msodbcsql18 \
+    && ACCEPT_EULA=Y apt-get install -y --no-install-recommends msodbcsql18 libgssapi-krb5-2 \
     && apt-get purge -y --auto-remove curl gnupg2 apt-transport-https \
     && rm -rf /var/lib/apt/lists/*