Add docs-build-push github workflow #7172

Job	Run time
Checks and variables	1m 46s
Unit Tests	1m 25s
NJS Unit Tests	12s
Build Binary	26s
Build Plus images / build	48s
Build OSS images (ngf, linux/arm64, linux/amd64) / build	1m 17s
Build OSS images (nginx, linux/arm64, linux/amd64) / build	1m 7s
Helm Tests	0s
Conformance tests (nginx, v1.30.2, false) / Run Tests	5m 40s
Conformance tests (nginx, v1.25.16, true) / Run Tests	7m 25s
Conformance tests (nginx, v1.30.2, true) / Run Tests	5m 51s
Conformance tests (nginx, v1.25.16, false) / Run Tests	6m 8s
Conformance tests (plus, v1.25.16, false) / Run Tests	5m 55s
Conformance tests (plus, v1.30.2, false) / Run Tests	6m 24s
Conformance tests (plus, v1.25.16, true) / Run Tests	6m 10s
Conformance tests (plus, v1.30.2, true) / Run Tests	6m 3s
Functional tests (nginx, v1.25.16) / Run Tests	9m 47s
Functional tests (nginx, v1.30.2) / Run Tests	9m 19s
Functional tests (plus, v1.25.16) / Run Tests	9m 33s
Functional tests (plus, v1.30.2) / Run Tests	9m 26s
Package and Publish Helm Chart	0s
	1h 34m 42s

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