Reuse prebuilt base image in build-container.sh when available#37177
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The container build previously always built the Vespa base layer from scratch on every run. When a PREBUILT_BASE_IMAGE is provided, point the build at "<PREBUILT_BASE_IMAGE>:<VESPA_BUILDOS_LABEL>" instead and build only the final "vespa" target (--target vespa), skipping the expensive base-image build. This skips downloading many 3rdparty packages. The same image is also used as the system-test base image.
esolitos
approved these changes
Jun 11, 2026
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The container build previously always built the Vespa base layer from scratch on every run. When a PREBUILT_BASE_IMAGE is provided, point the build at "<PREBUILT_BASE_IMAGE>:<VESPA_BUILDOS_LABEL>" instead and build only the final "vespa" target (--target vespa), skipping the expensive base-image build. This skips downloading many 3rdparty packages. The same image is also used as the system-test base image.