ci: provide docker socket on macos

Sometimes CI on macos fails with an error "docker daemon not running".

To avoid it after the patch docker socket is provided in the github env
directly.

Part of #931

.github/workflows/full-ci.yml

@@ -191,6 +191,11 @@ jobs:
         run: |
           echo "TT_CLI_TARANTOOL_PREFIX=${GITHUB_WORKSPACE}/include/" >> $GITHUB_ENV
 
+      - name: Prepare Docker
+        run: |
+          echo "DOCKER_HOST=unix:///${HOME}/.docker/run/docker.sock" >> $GITHUB_ENV
+          docker context use default
+
       - name: Run unit tests
         run: mage unitfull