getty,sshd: Include ca-certificates.

Otherwise:

    dist pull docker.io/library/redis:alpine
    dist: failed to do request: Head https://registry-1.docker.io/v2/library/redis/manifests/alpine: x509: failed to load system roots and no roots provided

Signed-off-by: Ian Campbell <ian.campbell@docker.com>

pkg/getty/Dockerfile

@@ -4,6 +4,7 @@ RUN mkdir -p /out/etc/apk && cp -r /etc/apk/* /out/etc/apk/
 RUN apk add --no-cache --initdb -p /out \
     alpine-baselayout \
     busybox \
+    ca-certificates \
     musl \
     tini \
     util-linux \

pkg/sshd/Dockerfile

@@ -4,6 +4,7 @@ RUN mkdir -p /out/etc/apk && cp -r /etc/apk/* /out/etc/apk/
 RUN apk add --no-cache --initdb -p /out \
     alpine-baselayout \
     busybox \
+    ca-certificates \
     musl \
     openssh-server \
     tini \