feat(terraform): add support for terraform repos

Add terraform as a project type, make the language optional, and add a
.gitignore and justfile template for Terraform repositories.

templates/terraform/.gitignore.twig

@@ -0,0 +1,45 @@
+# {{ managedText }}
+
+# Created by https://www.toptal.com/developers/gitignore/api/terraform
+# Edit at https://www.toptal.com/developers/gitignore?templates=terraform
+
+### Terraform ###
+# Local .terraform directories
+**/.terraform/*
+
+# Plans
+terraform.tfplan
+
+# .tfstate files
+*.tfstate
+*.tfstate.*
+
+# Crash log files
+crash.log
+crash.*.log
+
+# Exclude all .tfvars files, which are likely to contain sensitive data, such as
+# password, private keys, and other secrets. These should not be part of version
+# control as they are data points which are potentially sensitive and subject
+# to change depending on the environment.
+*.tfvars
+*.tfvars.json
+
+# Ignore override files as they are usually used to override resources locally and so
+# are not checked in
+override.tf
+override.tf.json
+*_override.tf
+*_override.tf.json
+
+# Include override files you do wish to add to version control using negated pattern
+# !example_override.tf
+
+# Include tfplan files to ignore the plan output of command: terraform plan -out=tfplan
+# example: *tfplan*
+
+# Ignore CLI configuration files
+.terraformrc
+terraform.rc
+
+# End of https://www.toptal.com/developers/gitignore/api/terraform

templates/terraform/justfile.twig

@@ -0,0 +1,25 @@
+# {{ managedText|raw }}
+
+default:
+  @just --list
+
+# Enable or disable Git hooks
+git-hooks command:
+  #!/usr/bin/env bash
+  set -euo pipefail
+
+  case "{{ '{{ command }}'|raw }}" in
+    "on")
+      echo "Enabling Git hooks..."
+      git config core.hooksPath .githooks
+      ;;
+    "off")
+      echo "Disabling Git hooks..."
+      git config --unset core.hooksPath
+      ;;
+    *)
+      echo "Error: Invalid argument. Must be either 'on' or 'off'"
+      ;;
+  esac
+
+# vim: ft=just