build: use mise to set up Terraform locally

Generated with:
$ cd infra/terraform
$ mise set --file mise.local.toml https_proxy=socks5://127.0.0.1:1122
$ MISE_DISABLE_BACKENDS=aqua mise use terraform@1.11.1

See also:
- jdx/mise#4606
- https://mise.jdx.dev/faq.html#how-do-i-use-mise-with-http-proxies

NOTE: proxy configuration has been moved to a local mise configuration that hasn't been commited to
Git as it's needed only for my local installation.

Part of #1748

Author: php-coder

.gitignore

@@ -57,3 +57,5 @@ prod_vars.yml
 # and also creates molecule directory
 *.pyc
 molecule/
+
+mise.local.toml

infra/terraform/README.md

@@ -4,12 +4,12 @@
 @todo #1720 Terraform: automate import of the existing resources
 -->
 
-* Install [tfenv](https://github.com/tfutils/tfenv) and terraform
+* Install Terraform
+  * the preferred way is to use [`mise`](https://mise.jdx.dev/getting-started.html). After its activation,
+    Terraform will be installed automatically once you `cd` into the `infra/terraform` directory
+* Navigate to the directory with Terraform configuration
   ```console
-  $ brew install tfenv
   $ cd infra/terraform
-  $ export HTTPS_PROXY=socks5://127.0.0.1:1122 # optionally
-  $ tfenv install
   ```
 * Setup credentials (only first time)
   ```console
@@ -18,7 +18,6 @@
   ```
 * Initialize and download modules (if needed)
   ```console
-  $ export HTTPS_PROXY=socks5://127.0.0.1:1122 # optionally
   $ terraform init
   ```
 * Import existing DigitalOcean configuration (optionally; only the first time)

infra/terraform/mise.toml

@@ -0,0 +1,2 @@
+[tools]
+terraform = "1.11.1"