dockerfile: add libsasl2-modules-gssapi-mit and krb5-user

libsasl2-modules-gssapi-mit is needed by librdkafka to use the
following configurations for authentication with Kafka:
```
rdkafka.security.protocol    SASL_SSL
rdkafka.sasl.mechanism       GSSAPI
```

krb5-user is needed by librdkafka to invoke `kinit` to obtains
ticket-granting tickets

These changes _cannot_ be added to the production image target
because librdkafka uses the `system` call to invoke `kinit`,
the distroless base does not have a shell, and we are not
going to add it.

Signed-off-by: Ryan Hall <[email protected]>
Signed-off-by: Bradley Laney <[email protected]>

Author: stoksc

dockerfiles/Dockerfile

@@ -239,6 +239,8 @@ RUN echo "deb http://deb.debian.org/debian bookworm-backports main" >> /etc/apt/
     libpsl5 \
     libbrotli1 \
     libsasl2-2 \
+    libsasl2-modules-gssapi-mit \
+    krb5-user \
     pkg-config \
     libpq5 \
     libsystemd0/bookworm-backports \