feat: added Gitlab CI

.gitlab-ci.yml

+image: docker:git
+
+services:
+  - docker:dind
+
+variables:
+  DOCKER_DRIVER: overlay2
+  DOCKER_TLS_CERTDIR: ""
+
+stages:
+  - build
+
+build-master:
+  stage: build
+  script:
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+    - DOCKER_BUILDKIT=1 docker build --pull -t "$CI_REGISTRY_IMAGE" .
+    - docker push "$CI_REGISTRY_IMAGE"
+  only:
+    - master
+
+build:
+  stage: build
+  script:
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+    - DOCKER_BUILDKIT=1 docker build --pull -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG" .
+    - docker push "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG"
+  except:
+    - master

Dockerfile

+#
+# Build stage
+#
+FROM debian:buster as build-env
+
+RUN apt-get update && apt-get install -y python3-pip wget
+RUN pip3 install pandoc-plantuml-filter
+
+# make slim-jdk
+RUN wget https://download.java.net/java/GA/jdk11/9/GPL/openjdk-11.0.2_linux-x64_bin.tar.gz -P /tmp/
+RUN tar xfvz /tmp/openjdk-11.0.2_linux-x64_bin.tar.gz -C /tmp/
+RUN /tmp/jdk-11.0.2/bin/jlink --output /opt/openjdk-11-slim \
+    --add-modules java.base,java.datatransfer,java.desktop,java.logging,java.prefs,java.scripting,java.xml
+
+# make plant UML
+RUN mkdir -p /opt/plantuml/ 
+RUN wget https://managedway.dl.sourceforge.net/project/plantuml/plantuml.jar -P /opt/plantuml/ 
+RUN echo '#!/bin/bash\n\
+    /opt/openjdk-11-slim/bin/java -jar /opt/plantuml/plantuml.jar $@' > /usr/bin/plantuml
+RUN chmod a+x /usr/bin/plantuml
+
+#
+# Run stage
+#
+FROM debian:buster as setup-env
+
+RUN apt-get update && apt-get install -y python3 pandoc graphviz libfreetype6 fontconfig \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN ln -s /usr/bin/python3 /usr/bin/python
+
+COPY --from=build-env /usr/local/lib/python3.7/dist-packages/ /usr/local/lib/python3.7/dist-packages/
+COPY --from=build-env /usr/bin/plantuml /usr/bin/plantuml
+COPY --from=build-env /usr/local/bin/pandoc-plantuml /usr/local/bin/pandoc-plantuml
+COPY --from=build-env /opt/plantuml/ /opt/plantuml/
+COPY --from=build-env /opt/openjdk-11-slim/ /opt/openjdk-11-slim/
+
+WORKDIR /var/docs/
+ENTRYPOINT ["pandoc", "--filter", "pandoc-plantuml"]
\ No newline at end of file

README.md

+# docker-pandoc-with-plantuml
+
+This is pandoc image with PlantUML.
+Forked from https://github.com/koduki/docker-pandoc-with-plantuml
+
+## Setup
+
+```bash
+docker pull koduki/pandoc
+alias pandoc="docker run -it -v `pwd`:/var/docs koduki/pandoc"
+```
+
+## Generate HTML with SVG
+
+```bash
+pandoc examples/input.md -o test.html
+```
+
+## Examples
+
+### List
+
+- list 1
+- list 2
+- list 3
+
+### Table
+
+| Right | Left | Default | Center |
+| ----: | :--- | ------- | :----: |
+|    12 | 12   | 12      |   12   |
+|   123 | 123  | 123     |  123   |
+|     1 | 1    | 1       |   1    |
+
+### PlantUML Example
+
+#### Sequence Diagram
+
+```plantuml
+Alice -> Bob: Authentication Request
+Bob --> Alice: Authentication Response
+
+Alice -> Bob: Another authentication Request
+Alice <-- Bob: another authentication Response
+```
+
+#### ER Diagrams
+
+```plantuml
+entity "entity1" {
+    id
+    --
+    attribute
+}
+
+entity "entity 2" as entity2 {
+    id
+    --
+    entity1_id
+}
+
+entity1         -----{          entity2
+
+```
+
+## Ref
+
+- [Pandoc](https://pandoc.org/)
+- [PlantUML](http://plantuml.com/)
+- [pandoc-plantuml-filter](https://github.com/timofurrer/pandoc-plantuml-filter)
+- [Markdown Preview Enhanced](https://shd101wyy.github.io/markdown-preview-enhanced/#/)

examples/input.md

+Makrdown Sample
+=========
+
+This is example for Markdown with UML and ER diagram.
+
+## List
+
+- list 1
+- list 2
+- list 3
+
+## Table
+
+|Right  | Left |Default  |Center  |
+|------:|:-----|---------|:------:|
+|   12  |  12  |    12   |    12  |
+|  123  |  123 |   123   |   123  |
+|    1  |    1 |     1   |     1  |
+
+
+## PlantUML Examples
+
+### Sequence Diagram
+
+```plantuml
+Alice -> Bob: Authentication Request
+Bob --> Alice: Authentication Response
+
+Alice -> Bob: Another authentication Request
+Alice <-- Bob: another authentication Response
+```
+
+### ER Diagrams
+
+```plantuml
+entity "entity1" {
+    id
+    --
+    attribute
+}
+
+entity "entity 2" as entity2 {
+    id
+    --
+    entity1_id
+}
+
+entity1         -----{          entity2
+
+```
+