add build automation

Makefile

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+build-%:
+	make -C $* build

openldap/Dockerfile

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+FROM debian:stable
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt update \
+    && apt install -y slapd \
+ && rm -rf /var/lib/apt/lists/*
+
+EXPOSE 389
+EXPOSE 636
+
+ENTRYPOINT ["/usr/sbin/slapd"]
+CMD []

openldap/Makefile

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+DOCKER ?= docker
+IMAGE ?= unit/slapd
+
+.PHONY: build
+build:
+	$(DOCKER) build -t $(IMAGE) .