wireguard: add to getty and sshd

People really want to play around with this, so adding them here makes
it possible. Just as iproute2 is part of these, so should
wireguard-tools.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

pkg/sshd/Dockerfile

@@ -1,4 +1,4 @@
-FROM linuxkit/alpine:a39a433162a873519910a07beeb3e8db22529956 AS mirror
+FROM linuxkit/alpine:4248059c38452217ff63853869df36034a890401 AS mirror
 
 RUN mkdir -p /out/etc/apk && cp -r /etc/apk/* /out/etc/apk/
 RUN apk add --no-cache --initdb -p /out \
@@ -10,6 +10,7 @@ RUN apk add --no-cache --initdb -p /out \
     openssh-server \
     tini \
     util-linux \
+    wireguard-tools \
     && true
 RUN mv /out/etc/apk/repositories.upstream /out/etc/apk/repositories