[1.x/2.x] CI improvements

[rennokki]

• Added benchmarks as conditional after CI succeeded
• Added support to build Docker images faster by using platform-specific starters
• Added armv7 and arm64 support for docker commits (excepting distroless where armv7 is not present)
• Cache layers between builds
• Improved Docker image sizes using multi-stage builds
• Bringing back package-lock.json

Docker image shrinking

• Debian images: 376.6 MB -> 99.6 MB (73% reduction)
• Alpine images: 82.9 MB -> 73 MB (12% reduction)
• Distroless images: unchanged (72.9 MB)

[codecov]

Codecov Report

Base: 84.43% // Head: 84.25% // Decreases project coverage by -0.18% ⚠️

Coverage data is based on head (9b53e7a) compared to base (495f8a0).
Patch coverage: 60.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##              1.x     #734      +/-   ##
==========================================
- Coverage   84.43%   84.25%   -0.19%     
==========================================
  Files          45       45              
  Lines        2532     2541       +9     
  Branches      458      458              
==========================================
+ Hits         2138     2141       +3     
- Misses        374      380       +6     
  Partials       20       20              

Impacted Files	Coverage Δ
src/http-handler.ts	71.57% <60.00%> (-1.22%)	⬇️

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