Update Terraform to 0.15.x

[github-actions]

The puzzle 1268-64454c39 from #1268 has to be resolved:

mystamps/infra/terraform/versions.tf

Line 2 in adfb6ef

# @todo #1268 Update Terraform to 0.15.x

Tech debt for: adfb6ef (#1268)

---

TODO:

• https://www.hashicorp.com/blog/announcing-hashicorp-terraform-0-14-general-availability
  • https://www.terraform.io/language/upgrade-guides/0-14
  • https://github.com/hashicorp/terraform/blob/v0.14/CHANGELOG.md
  • https://www.hashicorp.com/blog/terraform-0-14-adds-a-new-concise-diff-format-to-terraform-plans
  • https://www.hashicorp.com/blog/terraform-0-14-adds-the-ability-to-redact-sensitive-values-in-console-output
  • https://www.hashicorp.com/blog/terraform-0-14-introduces-a-dependency-lock-file-for-providers
• https://www.hashicorp.com/blog/announcing-hashicorp-terraform-0-15-general-availability
  • https://www.terraform.io/language/upgrade-guides/0-15
  • https://github.com/hashicorp/terraform/blob/v0.15/CHANGELOG.md
• variable do_token: add description, type and sensitive (https://www.terraform.io/language/values/variables) (and mark as done a similar intem in my-stamps.ru: migrate away from DigitalOcean #1631)
• execute terraform init -upgrade and commit .terraform.lock file
• revise TODOs from Update DigitalOcean Terraform Provider to 2.28.1 #1268

Upgrade instructions:

0.13
	terraform plan
	terraform apply
0.14
	<update versions>
	export HTTPS_PROXY=socks5://127.0.0.1:1122 # optionally
	tfenv install
	terraform init -upgrade
	terraform providers lock -platform=darwin_amd64 -platform=linux_amd64
	git add .terraform.lock.hcl
	terraform plan <...>
	terraform apply <...>
        encrypt tfstate && commit
        tfenv uninstall 0.13.7
0.15
       cd infra/terraform
       vim .terraform-version
       vim versions.tf
	export HTTPS_PROXY=socks5://127.0.0.1:1122 # optionally
	tfenv install
        tfenv list
        tfenv uninstall 0.14.11
	terraform init
        terraform plan -var-file terraform-data/terraform.tfvars -state terraform-data/terraform.tfstate -out terraform-data/terraform.tfplan
        terraform apply -state terraform-data/terraform.tfstate terraform-data/terraform.tfplan
        docker run -e VAULT_PASSWORD="$(cat ../../src/main/scripts/ci/ansible/ci-pass.txt)" -v "$PWD/terraform-data:/data/mystamps" -w /data/mystamps --rm -it ansible:2.10.17
        ansible-vault encrypt --vault-password-file vault-pass.txt --output terraform.tfstate.enc terraform.tfstate
        <exit shell>

[php-coder]

This requires update to 0.14 as well. See also: #1268