Add Terraform CI workflow

.github/workflows/terraform-ci.yml

@@ -1,14 +1,85 @@
 name: terraform-ci
+
 on:
   pull_request:
+    paths:
+      - "envs/**"
+      - ".github/workflows/terraform-ci.yml"
   push:
-    paths: ["envs/**", ".github/workflows/terraform-ci.yml"]
+    paths:
+      - "envs/**"
+      - ".github/workflows/terraform-ci.yml"
+
+permissions:
+  contents: read
+  id-token: write
+  pull-requests: write
+
+concurrency:
+  group: terraform-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
-  fmt-validate:
+  fmt-validate-plan:
+    name: fmt/validate/plan (envs/dev)
     runs-on: ubuntu-latest
+    environment: ci
+
     steps:
       - uses: actions/checkout@v4
-      - uses: hashicorp/setup-terraform@v3
-      - run: terraform -chdir=envs/dev fmt -check
-      - run: terraform -chdir=envs/dev init -backend=false
-      - run: terraform -chdir=envs/dev validate
+
+      - name: Setup Terraform
+        uses: hashicorp/setup-terraform@v3
+        with:
+          terraform_version: 1.6.6
+
+      - name: Configure AWS credentials (OIDC)
+        uses: aws-actions/configure-aws-credentials@v4
+        with:
+          role-to-assume: ${{ vars.AWS_ROLE_ARN }}
+          aws-region: ${{ vars.AWS_REGION }}
+
+      - name: Terraform fmt (check)
+        run: terraform -chdir=envs/dev fmt -check -recursive
+
+      - name: Terraform init
+        run: terraform -chdir=envs/dev init -no-color
+
+      - name: Terraform validate
+        run: terraform -chdir=envs/dev validate -no-color
+
+      - name: Terraform plan
+        run: terraform -chdir=envs/dev plan -no-color -out=plan.tfplan
+
+      - name: Render plan to text
+        run: terraform -chdir=envs/dev show -no-color plan.tfplan > envs/dev/plan.txt
+
+      - name: Upload plan artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: terraform-plan-${{ github.event.pull_request.number || github.run_number }}
+          path: |
+            envs/dev/plan.tfplan
+            envs/dev/plan.txt
+          retention-days: 7
+
+      - name: Comment plan (PR only)
+        if: github.event_name == 'pull_request'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const fs = require('fs');
+            const plan = fs.readFileSync('envs/dev/plan.txt', 'utf8');
+            const body = [
+              '### Terraform Plan (envs/dev)',
+              '',
+              '```',
+              plan.length > 60000 ? plan.slice(0, 60000) + '\n... (truncado)' : plan,
+              '```'
+            ].join('\n');
+            github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              body
+            });

iam/github-oidc/README.md

@@ -0,0 +1,42 @@
+# github-oidc
+
+<!-- BEGIN_TF_DOCS -->
+## Requirements
+
+| Name | Version |
+|------|---------|
+| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.6.6, < 2.0.0 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | ~> 5.0 |
+
+## Providers
+
+| Name | Version |
+|------|---------|
+| <a name="provider_aws"></a> [aws](#provider\_aws) | ~> 5.0 |
+
+## Modules
+
+No modules.
+
+## Resources
+
+| Name | Type |
+|------|------|
+| [aws_iam_openid_connect_provider.github](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/iam_openid_connect_provider) | resource |
+| [aws_iam_role.github_actions_terraform](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/iam_role) | resource |
+| [aws_iam_role_policy_attachment.admin](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/iam_role_policy_attachment) | resource |
+| [aws_iam_policy_document.assume_role](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
+
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|------|---------|:--------:|
+| <a name="input_aws_region"></a> [aws\_region](#input\_aws\_region) | n/a | `string` | `"us-east-1"` | no |
+| <a name="input_github_repo"></a> [github\_repo](#input\_github\_repo) | Formato OWNER/REPO (ej: juandiegocv27/infra-terraform) | `string` | n/a | yes |
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| <a name="output_role_arn"></a> [role\_arn](#output\_role\_arn) | n/a |
+<!-- END_TF_DOCS -->

iam/github-oidc/main.tf

@@ -0,0 +1,75 @@
+terraform {
+  required_version = ">= 1.6.6, < 2.0.0"
+
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 5.0"
+    }
+  }
+}
+
+provider "aws" {
+  region = var.aws_region
+}
+
+variable "aws_region" {
+  type    = string
+  default = "us-east-1"
+}
+
+variable "github_repo" {
+  type        = string
+  description = "Formato OWNER/REPO (ej: juandiegocv27/infra-terraform)"
+}
+
+resource "aws_iam_openid_connect_provider" "github" {
+  url             = "https://token.actions.githubusercontent.com"
+  client_id_list  = ["sts.amazonaws.com"]
+  thumbprint_list = ["6938fd4d98bab03faadb97b34396831e3780aea1"]
+}
+
+data "aws_iam_policy_document" "assume_role" {
+  statement {
+    effect  = "Allow"
+    actions = ["sts:AssumeRoleWithWebIdentity"]
+
+    principals {
+      type        = "Federated"
+      identifiers = [aws_iam_openid_connect_provider.github.arn]
+    }
+
+    # Audience debe ser STS
+    condition {
+      test     = "StringEquals"
+      variable = "token.actions.githubusercontent.com:aud"
+      values   = ["sts.amazonaws.com"]
+    }
+
+    # Permitir PRs, pushes a branches, y uso de Environment "ci"
+    condition {
+      test     = "StringLike"
+      variable = "token.actions.githubusercontent.com:sub"
+      values = [
+        "repo:${var.github_repo}:pull_request",
+        "repo:${var.github_repo}:ref:refs/heads/*",
+        "repo:${var.github_repo}:environment:ci",
+      ]
+    }
+  }
+}
+
+resource "aws_iam_role" "github_actions_terraform" {
+  name               = "github-actions-terraform-plan"
+  assume_role_policy = data.aws_iam_policy_document.assume_role.json
+}
+
+# Para arrancar rápido (luego bajás a least-privilege)
+resource "aws_iam_role_policy_attachment" "admin" {
+  role       = aws_iam_role.github_actions_terraform.name
+  policy_arn = "arn:aws:iam::aws:policy/AdministratorAccess"
+}
+
+output "role_arn" {
+  value = aws_iam_role.github_actions_terraform.arn
+}