community/cni-plugins: run ./build_linux.sh with sh not bash
The shellscripts have been changed upstream to be POSIX compliant.
Ref https://github.com/containernetworking/plugins/commit/853b82d19f4d6c4c09c3a82a8ddbdc1e048d8474
The shellscripts have been changed upstream to be POSIX compliant.
Ref https://github.com/containernetworking/plugins/commit/853b82d19f4d6c4c09c3a82a8ddbdc1e048d8474