ci: Runner and Builder Containerfiles (sourcenetwork#951)

tools/defradb-builder.containerfile

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+# syntax=docker/dockerfile:1
+
+# An image with defradb's code and go tooling available, to assemble in a larger container.
+
+FROM docker.io/golang:1.18 AS BUILD
+
+WORKDIR /lib/defradb/
+
+COPY . .
+RUN make deps:modules

tools/defradb.containerfile

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+# syntax=docker/dockerfile:1
+
+# An image to run defradb.
+
+# Stage: BUILD
+# Several steps are involved to enable caching and because of the behavior of COPY regarding directories.
+FROM docker.io/golang:1.18 AS BUILD
+WORKDIR /repo/
+COPY go.mod go.sum Makefile ./
+RUN make deps:modules
+COPY . .
+RUN make build
+
+# Stage: RUN
+FROM gcr.io/distroless/base-debian11
+COPY --from=BUILD /repo/build/defradb /defradb
+
+# Documents which ports are normally used.
+# To publish the ports: `docker run -p 9181:9181` ...
+EXPOSE 9161
+EXPOSE 9171
+EXPOSE 9181
+
+# Default command provided for convenience.
+# e.g. docker run -p 9181:9181 source/defradb  start --url 0.0.0.0:9181
+ENTRYPOINT [ "/defradb" ]