Building services wants a reproducible way to package a permits plan-review helper and its OS-level dependencies for every county runner. What role does a Dockerfile play?

Building services needs a reproducible way to package a permits plan-review helper and its OS-level dependencies for every county runner. The Dockerfile defines the steps to build a container image that packages application code and dependencies in a repeatable recipe. Build tools consume the Dockerfile to produce the same image layers across environments, which is the dependency-management and packaging value for municipal helpers. The option that says it defines how to build a container image that packages the helper and dependencies reproducibly is correct for that reason. The claim that it replaces Git entirely so source history is unnecessary is wrong; source history, review, and collaboration remain necessary, and containers package runtime artifacts rather than substituting for version control. The claim that it is only a human-readable FAQ and is never used by a build tool is wrong; docker build and allied pipelines execute the instructions. The claim that it encrypts resident permit PDFs at rest inside the assessor database is wrong; encryption and database controls are separate security mechanisms. Exam caveat: pin base images and dependency versions inside the Docker build context, run as non-root where possible, and publish images to an internal registry so county runners pull trusted artifacts rather than rebuilding ad hoc. Operational check: build the image from the Dockerfile on two runners, confirm identical critical dependency versions, run the plan-review helper smoke tests inside the container, and promote the tagged image through the county deployment path.