ci: GitLab pipeline for the cv-builder image.

This is the first of a few commits for creating
the GitLab CI pipeline for building and publishing my CV.
This commit adds a pipeline for building and publishing the cv-builder
docker image to the GitLab container registry.

Additions:

- The cv-builder docker image: This commit adds a Dockerfile for
building the cv-builder docker image. The image is based on the
golang (buster) image and installs ConTeXt (standalone version)
and the Carlito font.

- The gitlab-ci.yml file: This commit adds the gitlab-ci.yml file for
running the pipeline for building and publishing the docker image
to the GitLab Container Registry.

Changes:

- The Makefile now includes targets for building and publishing docker images.

.dockerignore

@@ -0,0 +1 @@
+*

.gitlab-ci.yml

@@ -0,0 +1,47 @@
+---
+stages:
+- test
+- build
+- publish
+
+variables:
+  IMAGE_NAME: ${CI_REGISTRY}/${CI_PROJECT_PATH}/cv-builder
+  IMAGE_TAG: ${CI_COMMIT_REF_SLUG}-${CI_COMMIT_SHORT_SHA}
+
+services:
+- docker:19.03.5-dind
+
+.use-docker:
+  image: docker:19.03.5
+
+.install-deps: &install-deps
+- apk add --no-cache make
+
+test:docker-image:
+  extends: .use-docker
+  script:
+  - *install-deps
+  - make image
+  stage: test
+  only:
+    changes:
+    - docker/Dockerfile
+  except:
+    refs:
+    - master
+
+publish:docker-image:
+  extends: .use-docker
+  before_script:
+  - docker login -u ${CI_REGISTRY_USER} -p ${CI_REGISTRY_PASSWORD} ${CI_REGISTRY}
+  after_script:
+  - docker logout ${CI_REGISTRY}
+  script:
+  - *install-deps
+  - make publish
+  stage: publish
+  only:
+    changes:
+    - docker/Dockerfile
+    refs:
+    - master@dananglin/cv

Makefile

@@ -1,9 +1,18 @@
+DOCKERFILE = ./docker/Dockerfile
+IMAGE_NAME ?= cv-builder
+IMAGE_TAG ?= latest
 OUTPUT_DIR = __output/
 
-.PHONY: all tex pdf clean
+.PHONY: all image publish tex pdf clean
 
 all: pdf
 
+image:
+	@docker build -f $(DOCKERFILE) -t $(IMAGE_NAME):$(IMAGE_TAG) .
+
+publish: image
+	@docker push $(IMAGE_NAME):$(IMAGE_TAG)
+
 tex:
 	@go run .
 

docker/Dockerfile

@@ -0,0 +1,28 @@
+FROM golang:1.13.5-buster
+
+# Upgrade packages and install dependencies
+RUN \
+    apt-get update && \
+    apt-get install -y --no-install-recommends \
+        fonts-crosextra-carlito \
+        rsync \
+    && \
+    apt-get clean autoclean && \
+    apt-get autoremove -y && \
+    rm -rf /var/lib/apt/lists/* /tmp/*
+
+# Install ConTeXt standalone
+RUN \
+    mkdir /opt/context && \
+    cd /opt/context && \
+    curl -LO http://minimals.contextgarden.net/setup/first-setup.sh && \
+    sh ./first-setup.sh \
+        --context=current \
+        --engine=luatex \
+    && \
+    rm -rf /opt/context/tex/texmf-context/doc
+
+ENV PATH=${PATH}:/opt/context/tex/texmf-linux-64/bin \
+    OSFONTDIR=/usr/share/fonts
+
+RUN mtxrun --script fonts --reload