Repo must be lower-case.

.drone.yml

@@ -10,5 +10,5 @@ steps:
       from_secret: repo_user
     password:
       from_secret: repo_pass
-    repo: SW/samba-dc
+    repo: sw/samba-dc
     tags: latest

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.16
+FROM alpine:edge
 MAINTAINER Rich Braun "docker@instantlinux.net"
 ARG BUILD_DATE
 ARG VCS_REF
@@ -24,7 +24,7 @@ ENV ADMIN_PASSWORD_SECRET=samba-admin-password \
     WINBIND_USE_DEFAULT_DOMAIN=yes \
     WORKGROUP=AD
 
-ARG SAMBA_VERSION=4.15.7-r0
+ARG SAMBA_VERSION=4.16.7-r0
 
 COPY *.conf.j2 /root/
 COPY entrypoint.sh /usr/local/bin/