dockerfiles: Add support for s390x to 2.1

[ajaypvictor]

• Adding support for linux-s390x in CI
• Added s390x specific cmake target to disable WASM and LuaJIT

Backporting s390x enablement via #8095

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Enter [N/A] in the box, if an item is not applicable to your change.

Testing
Before we can approve your change; please submit the following in a comment:

• Example configuration file for the change
• Debug log output from testing the change

• [N/A] Attached Valgrind output that shows no leaks or memory corruption was found

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

• [N/A] Run local packaging test showing all targets (including any new ones) build.
• [N/A] Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• Documentation required for this feature -- installation: platforms: add s390x to supported architectures fluent-bit-docs#1245

Backporting

• Backport to latest stable release.

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

[ajaypvictor]

Example config file change & Debug log output: #8095 (comment)