Build containerd in Alpine image

This makes it easier to add the containerd testing tools like
`containerd-stress` to test packages, for example, and also at
some point move `ctr` out of the base image as it can be installed
from the alpine image.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

tools/alpine/Dockerfile

@@ -40,7 +40,7 @@ RUN go get -u github.com/golang/lint/golint
 RUN go get -u github.com/gordonklaus/ineffassign
 RUN go get -u github.com/LK4D4/vndr
 
-# checkout containerd
+# checkout and compile containerd
 # Update `FROM` in `pkg/containerd/Dockerfile`, `pkg/init/Dockerfile` and
 # `test/pkg/containerd/Dockerfile` when changing this.
 ENV CONTAINERD_REPO=https://github.com/containerd/containerd.git
@@ -50,6 +50,9 @@ RUN mkdir -p $GOPATH/src/github.com/containerd && \
   git clone https://github.com/containerd/containerd.git && \
   cd $GOPATH/src/github.com/containerd/containerd && \
   git checkout $CONTAINERD_COMMIT
+RUN apk add --no-cache btrfs-progs-dev gcc libc-dev linux-headers make
+RUN cd $GOPATH/src/github.com/containerd/containerd && \
+  make binaries EXTRA_FLAGS="-buildmode pie" EXTRA_LDFLAGS="-extldflags \\\"-fno-PIC -static\\\""
 
 FROM $BASE
 

tools/alpine/versions.aarch64

@@ -1,4 +1,4 @@
-# linuxkit/alpine:415e9417004bbd8940a4c2303195b20a5dbd8c9a-arm64
+# linuxkit/alpine:a662efbaf4226d0ac358cc009ead9a95b3b1dd99-arm64
 # automatically generated list of installed packages
 abuild-3.0.0_rc2-r8
 alpine-baselayout-3.0.4-r0

tools/alpine/versions.x86_64

@@ -1,4 +1,4 @@
-# linuxkit/alpine:79987c65c66700171c073151c1d3f0372597bec2-amd64
+# linuxkit/alpine:77287352db68b442534c0005edd6ff750c8189f3-amd64
 # automatically generated list of installed packages
 abuild-3.0.0_rc2-r8
 alpine-baselayout-3.0.4-r0