luks: implements support for Alpine

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

templates/alpine.Dockerfile

@@ -6,6 +6,9 @@ RUN apk update --no-cache && \
     apk add \
       util-linux \
       linux-virt \
+{{- if .Luks }}
+      cryptsetup \
+{{- end }}
 {{- if ge .Release.VersionID "3.17" }}
       busybox-openrc \
       busybox-mdev-openrc \
@@ -29,3 +32,9 @@ allow-hotplug eth0\n\
 iface eth0 inet dhcp\n\
 ' > /etc/network/interfaces
 {{ end }}
+
+{{- if .Luks }}
+RUN source /etc/mkinitfs/mkinitfs.conf && \
+    echo "features=\"${features} cryptsetup\"" > /etc/mkinitfs/mkinitfs.conf && \
+    mkinitfs $(ls /lib/modules)
+{{- end }}

templates/debian.Dockerfile

@@ -4,6 +4,9 @@ USER root
 
 RUN apt-get -y update && \
     DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \
+{{- if .Luks }}
+      cryptsetup \
+{{- end }}
       linux-image-amd64
 
 RUN DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \

templates/ubuntu.Dockerfile

@@ -6,6 +6,9 @@ RUN apt-get update -y && \
   DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \
   linux-image-virtual \
   initramfs-tools \
+{{- if .Luks }}
+      cryptsetup \
+{{- end }}
   systemd-sysv \
   systemd \
   dbus \