Add docker image pushing

ci/release-image/push.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+main() {
+  cd "$(dirname "$0")/../.."
+
+  if [[ ${CI:-} ]]; then
+    echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+  fi
+
+  imageTag="codercom/code-server:$VERSION"
+  latest="codercom/code-server:latest"
+  if [[ $TRAVIS_CPU_ARCH == "arm64" ]]; then
+    imageTag+="-arm64"
+    latest="codercom/code-server:arm64"
+  fi
+  docker build -t "$imageTag" -t "$latest" -f ./ci/release-image/Dockerfile
+  docker push codercom/code-server
+}
+
+main "$@"