Add docker files

.gitlab-ci.yml

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+docker-build:
+  image: docker:latest
+  stage: build
+  services:
+    - docker:dind
+  before_script:
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+  # Default branch leaves tag empty (= latest tag)
+  # All other branches are tagged with the escaped branch name (commit ref slug)
+  script:
+    - |
+      if [[ "$CI_COMMIT_BRANCH" == "$CI_DEFAULT_BRANCH" ]]; then
+        tag=""
+        echo "Running on default branch '$CI_DEFAULT_BRANCH': tag = 'latest'"
+      else
+        tag=":$CI_COMMIT_REF_SLUG"
+        echo "Running on branch '$CI_COMMIT_BRANCH': tag = $tag"
+      fi
+    - docker build --pull -t "$CI_REGISTRY_IMAGE${tag}" .
+    - docker push "$CI_REGISTRY_IMAGE${tag}"
+  # Run this job in a branch where a Dockerfile exists
+  rules:
+    - if: $CI_COMMIT_BRANCH
+      exists:
+        - Dockerfile

Dockerfile

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+FROM debian:bullseye-slim
+
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install --no-install-recommends -y slapd fusiondirectory-schema fusiondirectory-plugin-mail-schema ldap-utils
+ENV DEBIAN_FRONTEND=readline
+RUN rm -rf /etc/ldap/slapd.d/* /var/lib/ldap/*
+
+
+EXPOSE 389 636
+
+ENV URL="ldap:/// ldapi:///"
+ENV CONF_DIR="/etc/ldap/slapd.d"
+ENV DB_DIR="/var/lib/ldap"
+ENV DEBUG_LEVEL="0"
+
+COPY ./start.sh /root/start.sh
+RUN chmod +x /root/start.sh
+
+ENTRYPOINT ["/root/start.sh"]

start.sh

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+#!/bin/bash
+
+if [ -z "$(ls -A "$CONF_DIR")" ] || [ -z "$(ls -A "$DB_DIR")" ]; then
+    echo "Reconfigure slapd"
+    dpkg-reconfigure -plow slapd
+
+    echo "Insert fusiondirectory schema"
+    slapd -F "$CONF_DIR" -u openldap -g openldap -h "$URL" -d "$DEBUG_LEVEL" &
+    slapd_pid=$!
+    sleep 2
+    fusiondirectory-insert-schema
+    kill -9 "$slapd_pid"
+    sleep 2
+fi
+
+echo "Starting slapd"
+slapd -F "$CONF_DIR" -u openldap -g openldap -h "$URL" -d "$DEBUG_LEVEL"
+echo "Slapd exited with code $?"