1061: generate multi-architecture (amd64, arm64) docker image

[denisa]

see https://github.com/denisa/terrascan/pkgs/container/terrascan

Note that the docker buildx build must build & push the image in a single operation, so I had to add some logic to the docker-build.sh script to support:

• building locally an image for the local computer architecture only
• building a multi-architecture image on CI

This PR also partially resolves warnings related to the deprecation of node.js 12; I did not attempt to update codecov/codecov-action@v1 as the most recent (v3) version is not compatible and I would not be able to test it.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[denisa]

@tenable/terrascan-maintainers … any comments?

[denisa]

@bkizer-tenable: any comment? Can this be merged?

[denisa]

@Rchanger , @srokade-tenable ?

[Rchanger]

@Rchanger , @srokade-tenable ?

sorry for late reply let me review it once and will get back,thank you for your efforts.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #1568 (dfc9a30) into master (659310c) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master    #1568   +/-   ##
=======================================
  Coverage   78.49%   78.49%           
=======================================
  Files         280      280           
  Lines        7906     7906           
=======================================
  Hits         6206     6206           
  Misses       1329     1329           
  Partials      371      371           

[denisa]

@Rchanger thank you for the approval.
How will this be merged? I can’t do it myself.

[Rchanger]

@Rchanger thank you for the approval. How will this be merged? I can’t do it myself.
I'll merge.