Attempt to fix CI permission issues

`learn-ocaml build` now requires write access to the repository since it writes
compilation artefacts in-place.

Author: AltGr

.github/workflows/build-and-test.yml

@@ -21,6 +21,8 @@ jobs:
         uses: actions/checkout@v2
       - name: Build Docker images
         run: "make docker-images"
+      - name: Fix permissions
+        run: "chmod -R a+wX demo-repository"
       - name: Run learn-ocaml build on demo-repository
         run: "docker run --rm -v $(pwd)/demo-repository:/repository learn-ocaml -- build"
       - name: Clone learn-ocaml-corpus inside tests/corpuses

tests/runtests.sh

@@ -67,6 +67,7 @@ wait_for_it () {
 run_server () {
     SYNC="$srcdir"/"$dir"/sync
     REPO="$srcdir"/"$dir"/repo
+    chmod -R a+w "$REPO"
 
     mkdir "$SYNC" 2>/dev/null
     chmod o+w "$SYNC"