feat: Add GHA workflow

Testing learn-ocaml-corpus with:

- ocamlsf/learn-ocaml:0.12
- ocamlsf/learn-ocaml:0.13.1
- ocamlsf/learn-ocaml:0.14.1
- ocamlsf/learn-ocaml:master

.github/workflows/test.yml

@@ -0,0 +1,28 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - '**'
+
+jobs:
+  test:
+    name: Run learn-ocaml on the corpus
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        server_image:
+          - 'ocamlsf/learn-ocaml:0.12'
+          - 'ocamlsf/learn-ocaml:0.13.1'
+          - 'ocamlsf/learn-ocaml:0.14.1'
+          # TODO: Keep up-to-date
+          - 'ocamlsf/learn-ocaml:master'
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v3
+      - name: Run learn-ocaml on the corpus
+        run: 'docker run --rm -v "$PWD":/repository ${{ matrix.server_image }} build'

README.md

@@ -1 +1,3 @@
 # The Learn OCaml Corpus
+
+[![CI](https://github.com/ocaml-sf/learn-ocaml-corpus/workflows/CI/badge.svg?branch=master)](https://github.com/ocaml-sf/learn-ocaml-corpus/actions?query=workflow%3ACI)