Utilise un submodule Git pour construire l'image.

.dockerignore

@@ -2,3 +2,4 @@
 /dist/
 /node_modules/
 /.?*
+.git

.gitlab-ci.yml

 stages:
   - build
 
+variables:
+  GIT_SUBMODULE_STRATEGY: recursive
+
 build:
   image: gitlab-registry.irstea.fr/pole-is/docker/docker-ci:dind
   tags: [dind]

.gitmodules

+[submodule "external/reveal.js"]
+    path = external/reveal.js
+    url = ../reveal.js
+    update = checkout
+    branch = irstea
+    shallow = true

Dockerfile

-FROM node
-
-RUN mkdir -p /src /dist /reveal_js
-RUN ln -snf /src /reveal_js/src
-RUN ln -snf /dist /reveal_js/dist
+FROM node:10 AS builder
 
 RUN umask 0044
 
-COPY package*.json /reveal_js/
+RUN mkdir -p /reveal_js
+
+COPY package*.json external Gruntfile.js /reveal_js/
 
 WORKDIR /reveal_js
 
@@ -16,12 +14,23 @@ ARG PANDOC_VERSION=2.7.3
 
 ADD https://github.com/jgm/pandoc/releases/download/${PANDOC_VERSION}/pandoc-${PANDOC_VERSION}-linux.tar.gz /tmp/pandoc.tar.gz
 
-RUN tar xvfz /tmp/pandoc.tar.gz -C /usr/local --strip-components=1 \
-    && rm /tmp/pandoc.tar.gz
+RUN tar xvfz /tmp/pandoc.tar.gz -C /usr/local --strip-components=1
+
+RUN chmod -R +rX /reveal_js/node_modules/.bin/* /usr/local/bin/*
+
+FROM node:10
 
-COPY . /reveal_js
+COPY --from=builder /reveal_js /reveal_js/
+COPY --from=builder /usr/local/bin/* /usr/local/bin/
+
+RUN mkdir -p /src /dist
+RUN ln -snf /src /reveal_js/src
+RUN ln -snf /dist /reveal_js/dist
+
+WORKDIR /reveal_js
 
-RUN chmod -R +rX /reveal_js /usr/local
+RUN pandoc --version
+RUN node_modules/.bin/grunt --version
 
 EXPOSE 80/tcp 8899/tcp
 

reveal.js @ a21b758e

+Subproject commit a21b758e7fcd612d541bbcbbd978a7d20f1f8108

package.json

@@ -27,13 +27,13 @@
     "grunt-http-server": "^2.1.0",
     "grunt-watcher": "^1.0.0",
     "readdirp": "^3.2.0",
-    "reveal.js": "git+https://gitlab.irstea.fr/guillaume.perreal/reveal.js.git#irstea"
+    "reveal.js": "file://./external/reveal.js"
   },
   "devDependencies": {
     "husky": "^1.3.1",
     "lint-staged": "^8.2.1",
     "load-grunt-tasks": "^5.1.0",
-    "prettier": "^6.5.1"
+    "prettier": "^1.19.0"
   },
   "husky": {
     "pre-commit": "lint-staged"