Use docker to run makefile tasks

[aledbf]

What this PR does / why we need it: documents makefile tasks, add a new help task and uses docker to run several tasks

make

Usage:
  make <target>
  help             Display this help
  all-container    Build image for amd64, arm and arm64.
  all-push         Publish images for amd64, arm and arm64.
  container        Build image for a particular arch.
  clean-container  Removes local image
  register-qemu    Register /usr/bin/qemu-ARCH-static as the handler for binaries in multiple platforms
  push             Publish image for a particular arch.
  build            Build ingress controller, debug tool and pre-stop hook.
  build-plugin     Build ingress-nginx krew plugin.
  clean            Remove .gocache directory.
  static-check     Run verification script for boilerplate, codegen, gofmt, golint and lualint.
  test             Run go unit tests.
  lua-test         Run lua unit tests.
  cover            Run go coverage unit tests.
  release          Build and publish images of the ingress controller.
  check_dead_links  Check if the documentation contains dead links.
  dep-ensure       Update and vendo go dependencies.
  dev-env          Starts a local Kubernetes cluster using minikube, building and deploying the ingress controller.
  live-docs        Build and launch a local copy of the documentation website in http://localhost:3000
  build-docs       Build documentation (output in ./site directory).
  misspell         Check for spelling errors.
  run-ingress-controller  Run the ingress controller locally using a kubectl proxy connection.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[aledbf]

/hold

[codecov-io]

Codecov Report

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The diff coverage is n/a.

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[aledbf]

/retest

[aledbf]

/test all

[aledbf]

/test all