fix CI using coq-library-undecidability github action file

.github/workflows/build.yml

@@ -1,70 +1,53 @@
-name: CI
+name: coq-library-fol CI
 
-on: [push, pull_request]
+on:
+  push:
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
 
-env:
-  OCAML_VERSION: 4.11.0
-  CACHE_KEY: opam-8.18-${{github.base_ref}}-${{github.ref}}
 jobs:
-  build-deps:
+  build:
     runs-on: ubuntu-latest
-    steps:
-    - name: Try to restore build cache
-      id: cache
-      uses: actions/cache@v3
-      with:
-        path: "~/.opam"
-        key: ${{env.CACHE_KEY}}
-        restore-keys: |
-          opam-8.18--refs/heads/${{github.base_ref}}
-
-    - name: Install OCaml
-      uses: avsm/setup-ocaml@v1
-      with:
-        ocaml-version: ${{env.OCAML_VERSION}}
-
-    - name: Checkout code
-      if: steps.cache.outputs.cache-hit != 'true'
-      uses: actions/checkout@v4
-      with:
-        fetch-depth: 1
 
-    - name: Build dependencies
-      if: steps.cache.outputs.cache-hit != 'true'
-      run: |
-        opam repo add coq-released https://coq.inria.fr/opam/released
-        opam update
-        opam upgrade
-        opam install . --deps-only --with-doc --with-test 
-        opam list --installed
+    strategy:
+      matrix:
+        coq_version: 
+          - '8.18'
+        ocaml_version:
+          - '4.14-flambda'
+      fail-fast: true
 
-  build-full:
-    needs: build-deps
-    runs-on: ubuntu-latest
     steps:
-    - name: Restore build cache
-      id: cache
-      uses: actions/cache@v3
-      with:
-        path: "~/.opam"
-        key: ${{env.CACHE_KEY}}
-
-    - name: Check sucess of cache restoration
-      if: steps.cache.outputs.cache-hit != 'true'
-      run: exit
-
-    - name: Install OCaml
-      uses: avsm/setup-ocaml@v1
-      with:
-        ocaml-version: ${{env.OCAML_VERSION}}
-
-    - name: Checkout code
-      uses: actions/checkout@v4
-      with:
-        fetch-depth: 1
-
-    - name: Build interfaces (vos)
-      run: opam exec -- make -j 2 vos TIMED=1
 
-    - name: Build full (vo)
-      run: opam exec -- make -j 2 all TIMED=1
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+
+      - name: Docker-Coq-Action
+        uses: coq-community/docker-coq-action@v1
+        with:
+          coq_version: ${{ matrix.coq_version }}
+          ocaml_version: ${{ matrix.ocaml_version }}
+          before_script: |
+            startGroup "Workaround permission issue"
+              sudo chown -R coq:coq .  # <--
+              opam exec -- ocamlfind list
+            endGroup
+          before_install: |
+            startGroup "Print opam config"
+              sudo chown -R coq:coq .  
+              opam config list; opam repo list; opam list
+            endGroup
+          script: |
+            startGroup "Build project"
+              opam exec -- make -j 2 all TIMED=1
+            endGroup
+          uninstall: |
+            startGroup "Clean project"
+            endGroup
+
+      - name: Revert permissions
+        # to avoid a warning at cleanup time
+        if: ${{ always() }}
+        run: sudo chown -R 1001:116 .  # <--