Notable Changes

• Set default etcd version to 3.4.13, current for Kubernetes 1.19, 1.20, and 1.21
• Build etcdadm with go v1.16.4

Summary

c77db63 Pare down InitSystem interface
c184acb Exclude etcd-manager from the style checks for the moment
72bb7da Temporarily skip etcd-manager gotest
fd4602a Always use etcdctl v3 interface
78a06ef Set default etcd version to 3.4.9, the version used by Kubernetes 1.19
8ce666d Add github actions tests from etcd-manager
09c24ee Makefile: make go image builder configurable
edcf198 build tooling: Allow custom tags to exist
72256f2 Initial cloudbuild staging job
9d97f8f update shellcheck url
53d6d70 Update Go to v1.15.6
2c0526e Build & stage etcd-manager also
bc2382e Use go.mod for verify-spelling
b1dda5b Run go mod tidy
194b29e Install bazel in staging build
57f73dc Fix staging build
3ed6a81 staging artifact upload: avoid double slash
f32ca82 Makefile: Update go version from 1.12 to 1.16
35377d3 staging build: copy dist directory recursively
3b2bb90 OWNERS: Add etcd-manager owners to top-level owners
4f6f893 Set default etcd version to 3.4.13, current for Kubernetes 1.19, 1.20, and 1.21

Note: The v0.1.4 tag did not get a release. The default etcd version was 3.4.9, and we updated that to 3.4.13.