Revert "Support building from forks (#299)"

This reverts commit 64597eb.

.github/workflows/terraform.yml

@@ -1,20 +1,37 @@
 name: "Terraform"
 
 on:
-  workflow_run:
-    workflows: [ "Check Terraform Scripts" ]
-    types:
-      - completed
-
+  pull_request:
+    branches:
+      - main
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
 jobs:
+  terraform_only_check:
+    if: github.repository_owner == 'quarkiverse'
+    name: Check for Terraform Scripts only change
+    outputs:
+      tf_only: ${{ steps.files.outputs.any_changed == 'true' || steps.files.outputs.any_deleted == 'true' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - id: files
+        name: Get changed files
+        uses: tj-actions/changed-files@v42
+        with:
+          files: terraform-scripts/**
+
   terraform:
     name: "Terraform"
     runs-on: ubuntu-latest
-    if: (github.repository_owner == 'quarkiverse')
+    if: (github.repository_owner == 'quarkiverse') && (needs.terraform_only_check.outputs.tf_only == 'true')
+    needs:
+      - terraform_only_check
     defaults:
       run:
         working-directory: ./terraform-scripts
@@ -43,13 +60,15 @@ jobs:
 
       - name: Terraform Plan
         id: plan
+        if: github.event_name == 'pull_request'
         run: |
           echo 'PLAN_RESULTS<<EOF' >> $GITHUB_ENV
           terraform plan -no-color | grep -v "Refreshing state...\|Reading...\|Read complete after" >> $GITHUB_ENV
           echo 'EOF' >> $GITHUB_ENV
         continue-on-error: true
 
       - uses: actions/github-script@v7
+        if: github.event_name == 'pull_request'
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |

terraform-scripts/README.md

@@ -20,7 +20,7 @@ IMPORTANT: Because the VCS is the single source of truth, you can't apply terraf
 
 New repositories are submitted via Pull Requests to the root directory in this repository.
 
-IMPORTANT: `@quarkiverse/quarkiverse-members` should be able to create new branches here. Non-members need to fork the repository and submit a PR from the fork.
+IMPORTANT: The branch must be created in the same repository, it won't work in a separate fork (`@quarkiverse/quarkiverse-members` should be able to create new branches here)
 
 1. Add a new `.tf` script in the `terraform-scripts/` directory with the following structure: