update CI with distinct jobs

.github/workflows/compat.yml

@@ -0,0 +1,38 @@
+
+name: Build compatibility test
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  run:
+    name: Build compatibility test
+    strategy:
+      fail-fast: true
+      matrix:
+        os:
+            - ubuntu-latest
+        ocaml-compiler:
+            - '4.03.x'
+            - '4.06.x'
+            - '4.07.x'
+            - '4.08.x'
+            - '4.13.x'
+
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use OCaml ${{ matrix.ocaml-compiler }}
+        uses: ocaml/setup-ocaml@v2
+        with:
+          ocaml-compiler: ${{ matrix.ocaml-compiler }}
+
+      - run: opam pin -n .
+      - run: opam depext -y containers containers-data containers-thread
+      - run: opam install containers containers-data containers-thread --deps-only
+      - run: opam exec -- dune build '@install'

.github/workflows/main.yml

@@ -11,33 +11,6 @@ on:
 jobs:
   run:
     name: Build
-    strategy:
-      fail-fast: true
-      matrix:
-        os:
-            - ubuntu-latest
-        ocaml-compiler:
-            - '4.03.x'
-            - '4.06.x'
-            - '4.07.x'
-            - '4.08.x'
-            - '4.13.x'
-
-    runs-on: ${{ matrix.os }}
-    steps:
-      - uses: actions/checkout@v2
-      - name: Use OCaml ${{ matrix.ocaml-compiler }}
-        uses: ocaml/setup-ocaml@v2
-        with:
-          ocaml-compiler: ${{ matrix.ocaml-compiler }}
-
-      - run: opam pin -n .
-      - run: opam depext -y containers containers-data containers-thread
-      - run: opam install containers containers-data containers-thread --deps-only
-      - run: opam exec -- dune build '@install'
-
-  run:
-    name: Build and test
     strategy:
       fail-fast: false
       matrix: