ci: set FORCE_UNSAFE_CONFIGURE=1

The newer version of Buildroot recently selected in the OP-TEE manifest
[1] does not allow building as root by default (apparently this is not
a Buildroot policy but rather defined in some packages included in
Buildroot). While this makes sense in general, we could not care less in
a CI container. Therefore set the appropriate environment variable to
bypass this check. We could as well change the Docker image to build as
a non-root user but let's just pick the easiest way for now.

Link: OP-TEE/manifest#281 [1]
Signed-off-by: Jerome Forissier <[email protected]>
Acked-by: Jens Wiklander <[email protected]>

.github/workflows/ci.yml

@@ -25,6 +25,7 @@ jobs:
           set -e -v
           export LC_ALL=C
           export BR2_CCACHE_DIR=/github/home/.cache/ccache
+          export FORCE_UNSAFE_CONFIGURE=1 # Prevent Buildroot error when building as root
           WD=$(pwd)
           cd ..
           TOP=$(pwd)/optee_repo_qemu_v8