updated gitlab to cache devops tool build

tools/devops/scripts/build.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+doPush=0
+if [[ "${CI_REGISTRY_USER}" != "" ]]; then
+    docker login -u ${CI_REGISTRY_USER} -p ${CI_REGISTRY_PASSWORD}
+
+    releaseImg="${CI_REGISTRY_IMAGE}:devops-${CI_COMMIT_REF_NAME}"
+    doPush=1
+else :
+    releaseImg="devops"
+fi
+
+echo "release image: ${releaseImg}"
+
+docker pull ${releaseImg} || true
+
+docker build -f tools/devops/Dockerfile --cache-from ${releaseImg} -t ${releaseImg} .
+
+if [[ $doPush == 1 ]]; then
+    docker push ${releaseImg}
+fi
+
+binPath=$GOROOT/bin/devops
+echo "installing to: ${binPath}"
+
+docker run --rm --entrypoint=cat devops /devops > $binPath