feat: Expose ecr tag & scan variables in docker-build module

[codezninja]

Description

Simple PR to expose ECR variables related to image tag mutability & scan on push. Defaults are backward compatible.

Motivation and Context

Give the user the ability to choose lambda image build immutability & vulnerability scanning

Breaking Changes

N/A

How Has This Been Tested?

• I have tested and validated these changes using one or more of the provided examples/* projects

cd examples/container-image && \
terraform init && \
terraform apply -target module.docker_image -auto-approve && \
terraform destroy -target module.docker_image -auto-approve

[antonbabenko]

Thanks, @bondezbond !

v2.8.0 has been just released.

[github-actions]

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