Release workflow (OCamlPro#827)

* Release workflow

This PR adds a release workflow that build an artefact with
dune-release.

The workflow runs only on branch `v*.*.x`.

Should be tested on the branch `v2.5.x`.

* Replace make_release by the Release workflow

* Test the workflow on this PR

* Trigger the workflow

* Trigger the workflow

* Use the prelease of opam

We use the new flag `allow-prelease-opam` of the GitHub action
`setup-ocaml` to use the prelease version `2.2` of opam.

* Use the latest tag on the branch in the tarball

* Try to fetch tags with the GitHub action `checkout`

By default, this GitHub action doesn't retrieve the tags of the current
branch but we need to get these tags for `dune-release`.

* Use the current commit for the name of the artefact

* Run the release workflow only on `v*.*.*` branches

* Use workflow_dispatch

* Use OCaml 4.14.1 for the release workflow

.github/workflows/build.yml

@@ -81,28 +81,3 @@ jobs:
         uses: getsentry/action-git-diff-suggestions@main
         with:
           message: 'The following changes have been made after `make`:'
-
-  make_release:
-    name: Make package release
-    runs-on: ubuntu-latest
-
-    if: github.event_name == 'pull_request' || github.ref == 'refs/heads/main' || github.ref == 'refs/heads/next'
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-        with:
-          persist-credentials: false
-
-      - name: Use OCaml ${{ env.OCAML_DEFAULT_VERSION }}
-        uses: ocaml/setup-ocaml@v2
-        with:
-          allow-prerelease-opam: true
-          ocaml-compiler: ${{ env.OCAML_DEFAULT_VERSION }}
-          dune-cache: true
-
-      - name: Install dependencies
-        run: opam exec -- make deps
-
-      - name: Run make install
-        run: opam exec -- make install

.github/workflows/release.yml

@@ -0,0 +1,41 @@
+name: Release
+
+on:
+  workflow_dispatch
+
+env:
+  OCAML_DEFAULT_VERSION: 4.14.1
+  OPAMYES: true
+
+jobs:
+  dune_release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          persist-credentials: false
+          fetch-depth: 0
+          fetch-tags: true
+
+      - name: Use OCaml ${{ env.OCAML_DEFAULT_VERSION }}
+        uses: ocaml/setup-ocaml@v2
+        with:
+          allow-prerelease-opam: true
+          ocaml-compiler: ${{ env.OCAML_DEFAULT_VERSION }}
+          dune-cache: true
+
+      - name: Install dependencies
+        run: opam exec -- make deps
+
+      - name: Install dune-release
+        run: opam install dune-release
+
+      - name: Build the distribution archive
+        run: opam exec -- dune-release distrib
+
+      - name: Upload the artefact
+        uses: actions/upload-artifact@v3
+        with:
+          name: alt-ergo-${{github.sha}}.tbz
+          path: _build/alt-ergo-*.tbz