workflows: yaml build support

[patrick-stephens]

Add YAML support to build and runtime to ensure we provide #4690

Built and tested AMD64 container locally:

$ docker build -t test -f dockerfiles/Dockerfile.x86_64-master .
...
$ docker run --rm -it -v $PWD/packaging/testing/smoke/container/fluent-bit.yaml:/fluent-bit/etc/fluent-bit.yaml test /fluent-bit/bin/fluent-bit -c /fluent-bit/etc/fluent-bit.yaml
Fluent Bit v1.9.0
* Copyright (C) 2015-2021 The Fluent Bit Authors
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
* https://fluentbit.io

[2022/02/14 17:46:28] [ info] [engine] started (pid=1)
[2022/02/14 17:46:28] [ info] [storage] version=1.1.6, initializing...
[2022/02/14 17:46:28] [ info] [storage] in-memory
[2022/02/14 17:46:28] [ info] [storage] normal synchronization mode, checksum disabled, max_chunks_up=128
[2022/02/14 17:46:28] [ info] [cmetrics] version=0.2.3
[2022/02/14 17:46:28] [ info] [http_server] listen iface=0.0.0.0 tcp_port=2020
[2022/02/14 17:46:28] [ info] [sp] stream processor started
[0] input: [1644860788.889459285, {"cpu_p"=>1.750000, "user_p"=>1.250000, "system_p"=>0.500000, "cpu0.p_cpu"=>0.000000, "cpu0.p_user"=>0.000000, "cpu0.p_system"=>0.000000, "cpu1.p_cpu"=>2.000000, "cpu1.p_user"=>1.000000, "cpu1.p_system"=>1.000000, "cpu2.p_cpu"=>3.000000, "cpu2.p_user"=>3.000000, "cpu2.p_system"=>0.000000, "cpu3.p_cpu"=>0.000000, "cpu3.p_user"=>0.000000, "cpu3.p_system"=>0.000000, "cpu4.p_cpu"=>0.000000, "cpu4.p_user"=>0.000000, "cpu4.p_system"=>0.000000, "cpu5.p_cpu"=>1.000000, "cpu5.p_user"=>0.000000, "cpu5.p_system"=>1.000000, "cpu6.p_cpu"=>3.000000, "cpu6.p_user"=>3.000000, "cpu6.p_system"=>0.000000, "cpu7.p_cpu"=>1.000000, "cpu7.p_user"=>1.000000, "cpu7.p_system"=>0.000000, "cpu8.p_cpu"=>3.000000, "cpu8.p_user"=>2.000000, "cpu8.p_system"=>1.000000, "cpu9.p_cpu"=>2.000000, "cpu9.p_user"=>1.000000, "cpu9.p_system"=>1.000000, "cpu10.p_cpu"=>1.000000, "cpu10.p_user"=>1.000000, "cpu10.p_system"=>0.000000, "cpu11.p_cpu"=>1.000000, "cpu11.p_user"=>1.000000, "cpu11.p_system"=>0.000000, "cpu12.p_cpu"=>2.000000, "cpu12.p_user"=>1.000000, "cpu12.p_system"=>1.000000, "cpu13.p_cpu"=>2.000000, "cpu13.p_user"=>2.000000, "cpu13.p_system"=>0.000000, "cpu14.p_cpu"=>2.000000, "cpu14.p_user"=>1.000000, "cpu14.p_system"=>1.000000, "cpu15.p_cpu"=>4.000000, "cpu15.p_user"=>3.000000, "cpu15.p_system"=>1.000000}]
...

Also built the multi-arch container (for the AMD64 target only):

$ docker build -t test-multiarch -f dockerfiles/Dockerfile.multiarch --build-arg FLB_TARBALL=https://github.com/fluent/fluent-bit/archive/master.tar.gz .
...
$ docker run --rm -it -v $PWD/packaging/testing/smoke/container/fluent-bit.yaml:/fluent-bit/etc/fluent-bit.yaml test-multiarch /fluent-bit/bin/fluent-bit -c /fluent-bit/etc/fluent-bit.yaml

Ran local packaging tests as well.

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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

• 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.

• Attached local packaging test output showing all targets (including any new ones) build.

Documentation

• Documentation required for this feature

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.