3.5: remove the dependency on busybox

Signed-off-by: Benjamin Wang <wachao@vmware.com>

Dockerfile-release.amd64

@@ -1,20 +1,16 @@
-FROM --platform=linux/amd64 busybox:1.34.1 as source
-FROM --platform=linux/amd64 gcr.io/distroless/base-debian11
-
-COPY --from=source /bin/sh /bin/sh
-COPY --from=source /bin/mkdir /bin/mkdir
+FROM --platform=linux/amd64 gcr.io/distroless/static-debian11
 
 ADD etcd /usr/local/bin/
 ADD etcdctl /usr/local/bin/
 ADD etcdutl /usr/local/bin/
-RUN mkdir -p /var/etcd/
-RUN mkdir -p /var/lib/etcd/
+
+WORKDIR /var/etcd/
+WORKDIR /var/lib/etcd/
 
 # Alpine Linux doesn't use pam, which means that there is no /etc/nsswitch.conf,
 # but Golang relies on /etc/nsswitch.conf to check the order of DNS resolving
 # (see https://github.com/golang/go/commit/9dee7771f561cf6aee081c0af6658cc81fac3918)
-# To fix this we just create /etc/nsswitch.conf and add the following line:
-RUN echo 'hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4' >> /etc/nsswitch.conf
+ADD nsswitch.conf /etc/nsswitch.conf
 
 EXPOSE 2379 2380
 

Dockerfile-release.arm64

@@ -1,15 +1,11 @@
-FROM --platform=linux/arm64 busybox:1.34.1 as source
-FROM --platform=linux/arm64 gcr.io/distroless/base-debian11
-
-COPY --from=source /bin/sh /bin/sh
-COPY --from=source /bin/mkdir /bin/mkdir
+FROM --platform=linux/arm64 gcr.io/distroless/static-debian11
 
 ADD etcd /usr/local/bin/
 ADD etcdctl /usr/local/bin/
 ADD etcdutl /usr/local/bin/
-ADD var/etcd /var/etcd
-ADD var/lib/etcd /var/lib/etcd
-ENV ETCD_UNSUPPORTED_ARCH=arm64
+
+WORKDIR /var/etcd/
+WORKDIR /var/lib/etcd/
 
 EXPOSE 2379 2380
 

Dockerfile-release.ppc64le

@@ -1,14 +1,11 @@
-FROM --platform=linux/ppc64le busybox:1.34.1 as source
-FROM --platform=linux/ppc64le gcr.io/distroless/base-debian11
-
-COPY --from=source /bin/sh /bin/sh
-COPY --from=source /bin/mkdir /bin/mkdir
+FROM --platform=linux/ppc64le gcr.io/distroless/static-debian11
 
 ADD etcd /usr/local/bin/
 ADD etcdctl /usr/local/bin/
 ADD etcdutl /usr/local/bin/
-ADD var/etcd /var/etcd
-ADD var/lib/etcd /var/lib/etcd
+
+WORKDIR /var/etcd/
+WORKDIR /var/lib/etcd/
 
 EXPOSE 2379 2380
 

Dockerfile-release.s390x

@@ -1,15 +1,11 @@
-FROM --platform=linux/s390x busybox:1.34.1 as source
-FROM --platform=linux/s390x gcr.io/distroless/base-debian11
-
-COPY --from=source /bin/sh /bin/sh
-COPY --from=source /bin/mkdir /bin/mkdir
-
+FROM --platform=linux/s390x gcr.io/distroless/static-debian11
 
 ADD etcd /usr/local/bin/
 ADD etcdctl /usr/local/bin/
 ADD etcdutl /usr/local/bin/
-ADD var/etcd /var/etcd
-ADD var/lib/etcd /var/lib/etcd
+
+WORKDIR /var/etcd/
+WORKDIR /var/lib/etcd/
 
 EXPOSE 2379 2380
 

nsswitch.conf

@@ -0,0 +1,2 @@
+hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4
+

scripts/build-docker

@@ -32,6 +32,8 @@ mkdir -p "${IMAGEDIR}"/var/etcd
 mkdir -p "${IMAGEDIR}"/var/lib/etcd
 cp "${BINARYDIR}"/etcd "${BINARYDIR}"/etcdctl "${BINARYDIR}"/etcdutl "${IMAGEDIR}"
 
+cp ./nsswitch.conf "${IMAGEDIR}"
+
 cat ./"${DOCKERFILE}" > "${IMAGEDIR}"/Dockerfile
 
 if [ -z "$TAG" ]; then