gce: add scripts for CI nightly builds

images/capi/packer/gce/ci/nightly/README.md

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+## Configs for nightly builds
+
+The configurations in the directory is being used for the nightly job to build the images for GCE.
+
+The script that runs is [ci-gce-nightly.sh](../../../../scripts/ci-gce-nightly.sh)

images/capi/packer/gce/ci/nightly/overwrite-1-18.json

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+{
+  "build_timestamp": "nigthly",
+  "kubernetes_deb_version": "1.18.18-00",
+  "kubernetes_rpm_version": "1.18.18-0",
+  "kubernetes_semver": "v1.18.18",
+  "kubernetes_series": "v1.18"
+}

images/capi/packer/gce/ci/nightly/overwrite-1-19.json

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+{
+  "build_timestamp": "nigthly",
+  "kubernetes_deb_version": "1.19.10-00",
+  "kubernetes_rpm_version": "1.19.10-0",
+  "kubernetes_semver": "v1.19.10",
+  "kubernetes_series": "v1.19"
+}

images/capi/packer/gce/ci/nightly/overwrite-1-20.json

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+{
+  "build_timestamp": "nigthly",
+  "kubernetes_deb_version": "1.20.6-00",
+  "kubernetes_rpm_version": "1.20.6-0",
+  "kubernetes_semver": "v1.20.6",
+  "kubernetes_series": "v1.20"
+}

images/capi/scripts/ci-gce-nightly.sh

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+#!/bin/bash
+
+# Copyright 2021 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# 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.
+
+################################################################################
+# usage: ci-gce-nightly.sh
+# This program build all images for capi gce for the nightly build
+################################################################################
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+[[ -n ${DEBUG:-} ]] && set -o xtrace
+
+CAPI_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
+cd "${CAPI_ROOT}" || exit 1
+
+# Verify the required Environment Variables are present.
+: "${GOOGLE_APPLICATION_CREDENTIALS:?Environment variable empty or not defined.}"
+: "${GCP_PROJECT:?Environment variable empty or not defined.}"
+
+if [[ -z "$GOOGLE_APPLICATION_CREDENTIALS" ]]; then
+  cat <<EOF
+GOOGLE_APPLICATION_CREDENTIALS is not set.
+Please set this to the path of the service account used to run this script.
+EOF
+  return 2
+else
+  gcloud auth activate-service-account --key-file="${GOOGLE_APPLICATION_CREDENTIALS}"
+fi
+
+# assume we are running in the CI environment as root
+# Add a user for ansible to work properly
+groupadd -r packer && useradd -m -s /bin/bash -r -g packer packer
+chown -R packer:packer /home/prow/go/src/sigs.k8s.io/image-builder
+# use the packer user to run the build
+
+# build image for 1.18
+# using PACKER_FLAGS=-force to overwrite the previous image and keep the same name
+su - packer -c "bash -c 'cd /home/prow/go/src/sigs.k8s.io/image-builder/images/capi && PATH=$PATH:~packer/.local/bin:/home/prow/go/src/sigs.k8s.io/image-builder/images/capi/.local/bin GCP_PROJECT_ID=$GCP_PROJECT GOOGLE_APPLICATION_CREDENTIALS=$GOOGLE_APPLICATION_CREDENTIALS PACKER_VAR_FILES=packer/gce/ci/nightly/overwrite-1-18.json PACKER_FLAGS=-force make deps-gce build-gce-all'"
+
+# build image for 1.19
+# using PACKER_FLAGS=-force to overwrite the previous image and keep the same name
+su - packer -c "bash -c 'cd /home/prow/go/src/sigs.k8s.io/image-builder/images/capi && PATH=$PATH:~packer/.local/bin:/home/prow/go/src/sigs.k8s.io/image-builder/images/capi/.local/bin GCP_PROJECT_ID=$GCP_PROJECT GOOGLE_APPLICATION_CREDENTIALS=$GOOGLE_APPLICATION_CREDENTIALS PACKER_VAR_FILES=packer/gce/ci/nightly/overwrite-1-19.json PACKER_FLAGS=-force make deps-gce build-gce-all'"
+
+# build image for 1.20
+# using PACKER_FLAGS=-force to overwrite the previous image and keep the same name
+su - packer -c "bash -c 'cd /home/prow/go/src/sigs.k8s.io/image-builder/images/capi && PATH=$PATH:~packer/.local/bin:/home/prow/go/src/sigs.k8s.io/image-builder/images/capi/.local/bin GCP_PROJECT_ID=$GCP_PROJECT GOOGLE_APPLICATION_CREDENTIALS=$GOOGLE_APPLICATION_CREDENTIALS PACKER_VAR_FILES=packer/gce/ci/nightly/overwrite-1-20.json PACKER_FLAGS=-force make deps-gce build-gce-all'"
+
+echo "Displaying the generated image information"
+filter="name~cluster-api-ubuntu-1804-*"
+gcloud compute images list --project "$GCP_PROJECT" \
+  --no-standard-images --filter="${filter}"