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Set up a Jenkins Declarative Pipeline that runs test stages in parallel inside Docker agents, injects credentials securely, and cleans up containers automatically.
The trade-off Packer (HCL2 templates, assuming a recent 1.10+ release) runs every build block in one template concurrently by default, with -parallel-builds available to cap or serialize them. The alternative is splitting images into separate templates and invoking packer build one at a time in the pipeline. The constraint is a single shared build host with
docker