Packaging: Enable ZSTD compression by default

[illescad]

I've been performance testing enabling compression using the Kafka output plugin. For compression options we wanted to see if ZSTD would work for us, but i found that ZSTD is not available because it was built without ZSTD support enabled.

Error:
Attempting to use rdkafka.compression.codec: zstd encountered errors that libzstd was not available at build time. This occurs because libzstd-devel is not part of the standard distro repos and is missing from the docker packaging environment during the yum install phase.

Will it be a good idea to modify the Docker packaging scripts to include the libzstd-devel headers during the build process?
And do we want to enable this for all distros?

Also i might be missing a step but i attempted to package fluent-bit by enabling ZSTD with an environment variable and i verified the package lacks any dependency on libzstd, confirming that the feature was disabled during the build phase because of missing development headers in the packaging environment.
FLB_ZSTD=On ./packaging/build.sh -d centos/8

[elempius]

@illescad any success with building the image on your own (with the required zstd packages)?