Cherrypick commits 9768494, 5fd33e1 (#149)

* updated dockerfile name and base image

* Set GOOS,GOARCH env and ldflags option in .ci/build file (#147)

* set GOOS,GOARCH env and ldflags option

* -w flag in --ldflags introduced

* rollback some cherry-pick changes

Co-authored-by: Himanshu Sharma <79965161+himanshu-kun@users.noreply.github.com>

.ci/build

@@ -59,8 +59,9 @@ fi
 
 # If no LOCAL_BUILD environment variable is set, we configure the `go build` command
 # to build for linux OS, amd64 architectures and without CGO enablement.
+# ldflags used, same as Makefile , this reduces size of binary considerably
 if [[ -z "$LOCAL_BUILD" ]]; then
-  GO111MODULE=off go build \
+  CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=off go build --ldflags="-s -w" \
     -a \
     -v \
     -o ${BINARY_PATH}/cluster-autoscaler/cluster-autoscaler \

cluster-autoscaler/Dockerfile

@@ -11,7 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-ARG BASEIMAGE=gcr.io/distroless/base:latest
+ARG BASEIMAGE=gcr.io/distroless/static:latest-amd64
 FROM $BASEIMAGE
 LABEL maintainer="Marcin Wielgus <mwielgus@google.com>"