docs: update Dockerfile to use Go modules and go install #2002
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What this PR contributes
This PR updates the documentation to include an updated Dockerfile that simplifies the build process for amazon-ecr-credential-helper. The following changes have been made:
Enabled Go modules (GO111MODULE=on)
Simplified installation using go install with the latest version of the repository
Set a default command to run docker-credential-ecr-login
Added comments for better readability and maintainability