Unfortunately, Bazel does not stick to the version installed in the devcontainer. In absence of an ebclfsa/.bazelversion it decides to pick "latest" from the download page, which is broken (or at least not compatible). Hence, the build fails.
Workaround
Follow the Quickstart as described, but just before calling
cd ./ebclfsa && bazel build --config=aarch64-ebclfsa //scrample_integration:run
please create a file ebclfsa/.bazelversion with the following content: "8.3.1" (without the quotes). This will tell Bazel to stick to the supported version. Then the rest of the Quickstart works as described.