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Auto-trigger docker build for terragrunt when new terraform version is related.

• Never use tag latest in prod environment.
• Multi-Arch supported (linux/amd64, linux/arm64, linux/386)
• For examples, below tags are supported now:
  • alpine/terragrunt:latest
  • alpine/terragrunt:1.8.4 (terraform version)
  • alpine/terragrunt:tf1.8.4 (terraform version)
  • (TODO, not ready yet) alpine/terragrunt:otf1.7.1 (opentofu version)

• terraform - terraform version is this docker image's tag
• terragrunt - The latest terragrunt version when running the build.
• boilerplate - The latest boilerplate version when running the build.
• terraform-docs - The latest terraform-docs version when running the build.
• (TODO, not ready yet) OpenTofu - the latest opentofu version when running the build

https://github.com/alpine-docker/terragrunt

https://app.circleci.com/pipelines/github/alpine-docker/terragrunt

https://hub.docker.com/r/alpine/terragrunt/tags/

• linux/arm64
• linux/amd64
• linux/386

This is mostly used during Continuous Integration and Continuous Delivery (CI/CD), or as a component of an automated build and deployment process.

# (1) must mount the local folder to /apps in container.
# (2) must mount the aws credentials and ssh config folder in container.
$ docker run -ti --rm -v $HOME/.aws:/root/.aws -v ${HOME}/.ssh:/root/.ssh -v `pwd`:/apps alpine/terragrunt:0.12.16 bash
#
# common terraform steps
$ terraform init
$ terraform fmt
$ terraform validate
$ terraform plan
$ terraform apply

# common opentofu steps
$ tofu init
$ tofu fmt
$ tofu validate
$ tofu plan
$ tofu apply

# common terragrunt steps
# cd to terragrunt configuration directory, if required.
# Terraform and OpenTofu Version Compatibility Table
# https://terragrunt.gruntwork.io/docs/getting-started/supported-versions/
$ terragrunt hclfmt
$ terragrunt run-all plan
$ terragrunt run-all apply

• Enable CI cronjob on this repo to run build weekly on master branch
• Check if there are new versions announced via Terraform Github REST API
• Match the exist docker image tags via Hub.docker.io REST API
• If not matched, build the image with latest terraform version as tag and push to hub.docker.com
• Always install latest version of terragrunt