Use any latest samba-dc package.

Dockerfile

@@ -25,11 +25,11 @@ ENV ADMIN_PASSWORD_SECRET=samba-admin-password \
     WINBIND_USE_DEFAULT_DOMAIN=yes \
     WORKGROUP=AD
 
-ARG SAMBA_VERSION=4.16.7-r1
+#ARG SAMBA_VERSION=4.16.7-r1
 
 COPY *.conf.j2 /root/
 COPY entrypoint.sh /usr/local/bin/
-RUN apk add --update --no-cache krb5 ldb-tools samba-dc=$SAMBA_VERSION tdb \
+RUN apk add --update --no-cache krb5 ldb-tools samba-dc tdb \
       bind bind-libs bind-tools libcrypto1.1 libxml2 tzdata && \
     chmod 0755 /usr/local/bin/entrypoint.sh