feat(tf): Add a reusable workflow to run terraform apply (#16)

Author: benoit-garcia

.github/workflows/merge_tf.yaml

@@ -0,0 +1,29 @@
+---
+name: "Terraform: Apply Changes"
+
+"on":
+  workflow_call:
+jobs:
+  terraform:
+    name: "Terraform"
+    runs-on: ubuntu-latest
+    steps:
+      - id: repo_checkout
+        name: "Repository: Checkout"
+        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b  # v4.1.4
+      - id: tf_version
+        name: "Terraform: Get version"
+        run: |
+          TF_VERSION=$(cat .terraform-version 2>/dev/null || echo latest)
+          echo "TF_VERSION=$TF_VERSION" >> $GITHUB_OUTPUT
+      - id: tf_setup
+        name: "Terraform: Setup"
+        uses: hashicorp/setup-terraform@97f030cf6dc0b4f5e0da352c7bca9cca34579800  # v3.1.0
+        with:
+          terraform_version: ${{steps.tf_version.outputs.TF_VERSION}}
+      - id: tf_init
+        name: "Terraform: Prepare working directory"
+        run: terraform init
+      - id: tf_apply
+        name: "Terraform: Apply terraform plan"
+        run: terraform apply -auto-approve -input=false -no-color

README.md

@@ -61,3 +61,17 @@ jobs:
     uses: scaleway-terraform-modules/wokflows/.github/workflows/check_yaml.yaml@main
 
 ```
+
+## merge_tf.yaml
+
+Apply any changes on the infrastructure.
+
+Include the following jobs in your existing workflows to use the workflow:
+```yaml
+[...]
+jobs:
+  merge_tf:
+    uses: scaleway-terraform-modules/wokflows/.github/workflows/merge_tf.yaml@main
+    secrets: inherit
+
+```