.github: disable apparmor restrictions also for distcheck job

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

Author: troglobit

.github/workflows/build.yml

@@ -69,6 +69,9 @@ jobs:
         run: |
           ./autogen.sh
           ./configure --prefix=
+      - name: Enable unprivileged userns (unshare)
+        run: |
+          sudo sysctl kernel.apparmor_restrict_unprivileged_userns=0
       - name: Build & Check
         run: |
           make distcheck