chore(*) scripts for build, publish and fetch Envoy binaries

[lobkovilya]

Summary

Current PR introduces targets make build/envoy that allows to build and fetch Envoy binaries (see README.md).

Also, current PR changes the way kuma-dp image obtains Envoy binary. Previously we copied Envoy binary from envoyproxy/envoy-alpine image:

COPY --from=envoyproxy/envoy-alpine:v1.18.4 /usr/local/bin/envoy /usr/local/bin

Now we copy the binary from build/artifact-* directory:

ADD $KUMA_ROOT/build/artifacts-linux-amd64/envoy /usr/bin

In order for Envoy binary to appear in build/artifacts-* directory, we must call make build/artifacts-darwin-amd64/envoy target. This is not a .PHONY target which means it won't run if binary already exists.

Target build/artifacts-%-amd64/envoy runs in 2 modes: fetch required binary from download.konghq.com or build the binary from source code. Modes could be switched using BUILD_ENVOY_FROM_SOURCES variable, default behavior is fetching so BUILD_ENVOY_FROM_SOURCES=false.

Note: This PR doesn't affect CI or change the Envoy version. These changes will be presented in another PRs.

Full changelog

• kuma-dp and kuma-universal images are built using Envoy binary fetched from download.konghq.com

Issues resolved

N/A

Documentation

• Link to the website documentation PR

Testing

• Unit tests
• E2E tests
• Manual testing on Universal
• Manual testing on Kubernetes

Backwards compatibility

• Add backport-to-stable label if the code is backwards compatible. Otherwise, list breaking changes.

[michaelbeaumont]

Will the uploading of the binaries also be covered in the next PR?

[jpeach]

xref #2627

[codecov-commenter]

Codecov Report

Merging #3110 (cac3c55) into master (1f507fd) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3110      +/-   ##
==========================================
+ Coverage   52.35%   52.36%   +0.01%     
==========================================
  Files         919      919              
  Lines       53208    53208              
==========================================
+ Hits        27855    27864       +9     
+ Misses      23124    23123       -1     
+ Partials     2229     2221       -8     

Impacted Files	Coverage Δ
pkg/core/resources/manager/cache.go	85.71% <0.00%> (-2.60%)	⬇️
pkg/core/runtime/reports/reports.go	51.81% <0.00%> (-1.82%)	⬇️
pkg/plugins/resources/postgres/store.go	75.52% <0.00%> (+0.84%)	⬆️
pkg/core/managers/apis/mesh/mesh_manager.go	49.38% <0.00%> (+2.46%)	⬆️
pkg/defaults/mesh/mesh.go	77.77% <0.00%> (+3.70%)	⬆️
pkg/defaults/components.go	92.15% <0.00%> (+3.92%)	⬆️
pkg/defaults/mesh/signing_key.go	76.47% <0.00%> (+11.76%)	⬆️
pkg/defaults/mesh.go	85.71% <0.00%> (+21.42%)	⬆️

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[jpeach]

Just nits left. Overall, this is 🔥