Add Kaniko deprecation warning to README.

Move Kaniko Dockerfile to `docker` directory. Remove old Kaniko Dockerfile.
PowerDNS · Sep 5, 2023 · 72b7f3d · 72b7f3d
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diff --git a/Dockerfile-kaniko b/Dockerfile-kaniko
diff --git a/README.md b/README.md
@@ -249,6 +249,10 @@ https://hub.docker.com/repository/docker/powerdns/kaniko-pdns-builder/
 
 A custom Kaniko image for PDNS Builder, because the official Kaniko debug image only offers Busybox and the PDNS Builder also needs Bash, Git, Perl, rsync and perhaps more.
 
+### Deprecation Warning
+
+Eventually we want to get rid of Kaniko in our build systems, so do not depend too hard on this image.
+
 ### Building
 
 - `docker build -f Dockerfile-kaniko-pdns-builder -t powerdns/kaniko-pdns-builder:1.0.0 .`

diff --git a/Dockerfile-kaniko-pdns-builder → docker/Dockerfile-kaniko-pdns-builder b/Dockerfile-kaniko-pdns-builder → docker/Dockerfile-kaniko-pdns-builder
@@ -1,5 +1,6 @@
 FROM gcr.io/kaniko-project/executor:v1.12.0-debug AS kaniko
 
+# XXX 3.11 is EOL since 2021, update to 3.18
 FROM alpine:3.11
 
 RUN apk --no-cache add bash binutils coreutils git grep openssh-client perl rsync sed tree