metadata: bump linuxkit to v0.8

Dockerfile.dapper

@@ -9,7 +9,7 @@ RUN go get -d golang.org/x/lint/golint && \
     go install golang.org/x/lint/golint && \
     rm -rf /go/src /go/pkg
 RUN if [ "${ARCH}" == "amd64" ]; then \
-        curl -sL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s v1.15.0; \
+        curl -sL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s v1.27.0; \
     fi
 
 RUN go get -d github.com/rancher/trash && \

README.md

@@ -454,16 +454,17 @@ disk and run it from these commands.  That often makes it easier to do longer fo
 
 ### `k3os.data_sources`
 
-These are the data sources used for download config from cloud provider. The valid options are
+These are the data sources used for download config from cloud provider. The valid options are:
 
     aws
+    cdrom
+    digitalocean
     gcp
+    hetzner
     openstack
     packet
     scaleway
     vultr
-    hetzner
-    cdrom
 
 More than one can be supported at a time, for example:
 

images/20-progs/Dockerfile

@@ -3,7 +3,7 @@ ARG TAG
 ARG VERSION
 FROM ${REPO}/k3os-gobuild:${TAG} as gobuild
 
-ENV LINUXKIT 35ae4e028ccdc289af79715d3f04fdf9d13b5fba
+ENV LINUXKIT v0.8
 
 FROM gobuild as linuxkit
 RUN git clone https://github.com/linuxkit/linuxkit.git $GOPATH/src/github.com/linuxkit/linuxkit