Add opam example

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@ -24,6 +24,7 @@
- [Node - Yarn](#node---yarn)
- [Node - Yarn 2](#node---yarn-2)
- [OCaml/Reason - esy](#ocamlreason---esy)
- [OCaml/Reason - opam](#ocamlreason---opam)
- [PHP - Composer](#php---composer)
- [Python - pip](#python---pip)
- [Simple example](#simple-example)
@ -416,6 +417,30 @@ Esy allows you to export built dependencies and import pre-built dependencies.
if: steps.restore-cache.outputs.cache-hit != 'true'
```
## OCaml/Reason - opam
This example requires you to have `opam.locked` file which you can generate with `opam lock .`.
It's worth noting that even if lock file was change, it might be optimal to restore previous cache, so `hashFiles` in the key and if statement in "Save opam cache" step are optional.
```yaml
- name: Restore opam cache
id: restore-cache
uses: actions/cache/restore@v4
with:
path: _opam
key: ${{ runner.os }}-opam-${{ hashFiles('opam.locked') }}
- name: Install dependencies
run: opam install . --locked --deps-only -y
- name: Save opam cache
if: steps.restore-cache.outputs.cache-hit != 'true'
uses: actions/cache/save@v4
with:
path: _opam
key: ${{ steps.restore-cache.outputs.cache-primary-key }}
```
## PHP - Composer
```yaml