Get a working build for the etcd operator

CHANGELOG.md

@@ -3,9 +3,24 @@
 ### Added
 
 - Added `spec.Pod.ClusterDomain` to explicitly set the cluster domain used for the etcd member URLs. [#2082](https://github.com/coreos/etcd-operator/pull/2082)
+- Added `spec.Pod.HostPathVolume` to use hostpath volumes for etcd data.
+- Added `spec.LimitSizeToMaxReadyNodes` to prevent scaling up clusters when there is shortage of ready nodes.
+- Added `spec.Pod.RestartPolicy` to add configurable RestartPolicy for etcd pods. This is particularly useful for single-node etcd clusters that fail if the pod stops (e.g. during a node reboot).
+- Added a Helm Chart to deploy the operator and etcd clusters.
+- Added `Dockerfile` to build etcd-operator.
 
 ### Changed
 
+- Changes in the cluster object's type metadata:
+  - The `apiVersion` field has been changed from `etcd.database.coreos.com/v1beta2` to `etcd.database.canonical.com/v1beta3`
+- The annotation `etcd.database.coreos.com/scope: clusterwide` in `EtcdCluster` has been renamed to `etcd.database.canonical.com/scope: clusterwide`
+- Migrate to `apiextensions.k8s.io/v1` for the `EtcdCluster` CRD.
+- The etcd operator will no longer create CustomResourceDefinitions by default, they have been moved to `example/crd.yaml`.
+- Update Kubernetes to 0.17.1.
+- Update Prometheus.
+- Update etcd client library to 3.5.2.
+- Migrate to Go modules for building the operator.
+
 ### Removed
 
 ### Fixed

Dockerfile

@@ -0,0 +1,13 @@
+FROM golang:1.17 AS builder
+LABEL maintainer="Angelos Kolaitis <angelos.kolaitis@canonical.com>"
+WORKDIR /src
+COPY . /src
+RUN \
+    CGO_ENABLED=0 \
+    go build \
+        -a -ldflags "-s -w -extldflags '-static' -X github.com/coreos/etcd-operator/version.GitSHA=`git rev-parse --short HEAD || echo GitNotFound`" \
+        -o /operator ./cmd/operator
+
+FROM scratch
+COPY --from=builder /operator /operator
+CMD ["/operator"]