Attempt native imagebuilder image

REMOVED/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)

REMOVED/packer/gce/ci/nightly/overwrite-1-23.json

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+{
+  "build_timestamp": "nightly",
+  "kubernetes_deb_version": "1.23.15-00",
+  "kubernetes_rpm_version": "1.23.15-0",
+  "kubernetes_semver": "v1.23.15",
+  "kubernetes_series": "v1.23",
+  "service_account_email": "gcb-builder-cluster-api-gcp@k8s-staging-cluster-api-gcp.iam.gserviceaccount.com"
+}

REMOVED/packer/gce/ci/nightly/overwrite-1-24.json

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+{
+  "build_timestamp": "nightly",
+  "kubernetes_deb_version": "1.24.9-00",
+  "kubernetes_rpm_version": "1.24.9-0",
+  "kubernetes_semver": "v1.24.9",
+  "kubernetes_series": "v1.24",
+  "service_account_email": "gcb-builder-cluster-api-gcp@k8s-staging-cluster-api-gcp.iam.gserviceaccount.com"
+}

REMOVED/packer/gce/ci/nightly/overwrite-1-25.json

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+{
+  "build_timestamp": "nightly",
+  "kubernetes_deb_version": "1.25.5-00",
+  "kubernetes_rpm_version": "1.25.5-0",
+  "kubernetes_semver": "v1.25.5",
+  "kubernetes_series": "v1.25",
+  "service_account_email": "gcb-builder-cluster-api-gcp@k8s-staging-cluster-api-gcp.iam.gserviceaccount.com"
+}

REMOVED/packer/gce/ci/nightly/overwrite-1-26.json

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+{
+  "build_timestamp": "nightly",
+  "kubernetes_deb_version": "1.26.0-00",
+  "kubernetes_rpm_version": "1.26.0-0",
+  "kubernetes_semver": "v1.26.0",
+  "kubernetes_series": "v1.26",
+  "service_account_email": "gcb-builder-cluster-api-gcp@k8s-staging-cluster-api-gcp.iam.gserviceaccount.com"
+}