Initial commit

.gitlab-ci.yml

+build:
+  image:
+    name: gcr.io/kaniko-project/executor:debug
+    entrypoint: [""]
+  script:
+    - |
+      echo "{
+        \"auths\": {
+          \"$CI_REGISTRY\": {
+            \"username\":\"$CI_REGISTRY_USER\",
+            \"password\":\"$CI_REGISTRY_PASSWORD\"
+      }}}
+      " > /kaniko/.docker/config.json
+    - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile --destination $CI_REGISTRY_IMAGE:4.10
+  only:
+    - master

Dockerfile

+FROM alpine:3.11 as compilation
+
+ARG OCAML_VERSION=4.10.0
+
+RUN apk add gcc g++ make
+ADD https://github.com/ocaml/ocaml/archive/${OCAML_VERSION}.tar.gz /src/ocaml.tar.gz
+WORKDIR /src/ocaml
+RUN tar xzf ../ocaml.tar.gz --strip-components=1
+RUN ./configure
+RUN make world.opt
+RUN make install
+
+ARG OPAM_VERSION=2.1.0-alpha
+
+ADD https://github.com/ocaml/opam/releases/download/${OPAM_VERSION}/opam-full-${OPAM_VERSION}.tar.gz /src/opam.tar.gz
+WORKDIR /src/opam
+RUN tar xzf ../opam.tar.gz --strip-components=1
+RUN ./configure
+RUN make lib-ext
+RUN make
+RUN make install
+
+RUN rm -rf /src
+
+FROM alpine:3.11 as target
+LABEL Description="Minimal OCaml + opam Alpine container" Vendor="OCamlPro"
+
+RUN apk add gcc make curl
+COPY --from=compilation /usr/local /usr/local
+
+RUN addgroup -S ocaml && adduser -S ocaml -G ocaml -s /bin/sh
+USER ocaml
+WORKDIR /home/ocaml
+
+RUN ["/usr/local/bin/opam", "init", "-a", "--bare", "--disable-sandboxing"]

README.md

+This repo contains a simple Dockerfile for a minimal OCaml + opam container.
+It is used to generate images for (and using) gitlab.ocamlpro.com CI.