docs: add terraform autodiscovery (#1162)

assets/code_example/docs/plugins/autodiscovery/terraform/updatecli.d/default.yaml

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+name: "Terraform autodiscovery using git scm"
+scms:
+  default:
+    kind: git
+    spec:
+      url: https://github.com/updatecli-test/jenkins-infra-aws.git
+      branch: main
+
+autodiscovery:
+  # scmid is applied to all crawlers
+  scmid: default
+  crawlers:
+    terraform:
+      # platforms to request package checksums for, defaults to:
+      platforms:
+        - linux_amd64
+        - linux_arm64
+        - darwin_amd64
+        - darwin_arm64
+      # To ignore specific path
+      #ignore:
+      #  - path: <filepath relative to scm repository>
+      #  - providers:
+      #      # Ignoring provider updates for this provider
+      #      registry.terraform.io/hashicorp/aws:
+      #      # Ignore provider updates for this version
+      #      registry.terraform.io/hashicorp/kubernetes: "1.x"
+
+      ignore:
+      #  - path: <filepath relative to scm repository>
+      #  - providers:
+      #      # Ignoring provider updates for this provider
+      #      registry.terraform.io/hashicorp/aws:
+      #      # Ignore provider updates for this version
+      #      registry.terraform.io/hashicorp/kubernetes: "1.x"
+
+

content/en/docs/plugins/autodiscovery/terraform.adoc

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+---
+title: "Terraform"
+description: "Discover Terraform provider update"
+lead: "kind: terraform"
+draft: false
+images: []
+menu:
+  docs:
+    parent: "plugin-autodiscovery"
+weight: 130
+toc: true
+plugins:
+  - autodiscovery
+---
+
+== Description
+
+The Terraform crawler looks recursively for all Terraform provider updates from a specific root directory.
+Then for each of them, it tries to automate them.
+
+Automation is done by using two resources link:{{< ref "registry" >}}[`terraform/registry`] as the source and
+link:{{< ref "registry" >}}[`terraform/lock`] as the target.
+
+== Manifest
+=== Parameters
+
+{{< autodiscoveryparameters "terraform" >}}
+
+==== Example
+
+[source,yaml]
+----
+# updatecli.d/default.yaml
+{{<include "assets/code_example/docs/plugins/autodiscovery/terraform/updatecli.d/default.yaml">}}
+----