From bc324b98156b41c72285366ca5e2182c1e49c514 Mon Sep 17 00:00:00 2001
From: Miriam Goldman <miriamgoldman@pantheon.io>
Date: Tue, 30 Jul 2024 09:35:12 -0400
Subject: [PATCH] introduce closed PR workflow

---
 .github/workflows/multidev-removal.yml | 45 ++++++++++++++++++++++++++
 README.md                              |  6 +++-
 2 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 .github/workflows/multidev-removal.yml

diff --git a/.github/workflows/multidev-removal.yml b/.github/workflows/multidev-removal.yml
new file mode 100644
index 00000000..29719081
--- /dev/null
+++ b/.github/workflows/multidev-removal.yml
@@ -0,0 +1,45 @@
+name: Delete closed PR multidevs
+on:
+  pull_request:
+    types: [closed]
+
+jobs:
+  configure_env:
+    name: Configure environment and Terminus
+    runs-on: ubuntu-latest
+    steps:
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "8.2"
+
+  identify_sites:
+    runs-on: ubuntu-latest
+    needs: configure_env
+    steps:
+      - name: Install Terminus
+        uses: pantheon-systems/terminus-github-actions@main
+        with:
+          pantheon-machine-token: ${{ secrets.TERMINUS_TOKEN }}
+
+
+  remove_pr_env:
+    runs-on: ubuntu-latest
+    needs: [ identify_sites, configure_env ]
+    if: github.event_name = 'pull_request'
+    steps:
+      - name: Install Terminus
+        uses: pantheon-systems/terminus-github-actions@v1
+        with:
+          pantheon-machine-token: ${{ secrets.TERMINUS_TOKEN }}
+
+      - name: Determine target environment and maybe delete it
+        run: |
+          # Use the PR number as the environment name
+          env=$(echo ${{ github.ref_name }} | sed 's|^\([0-9]*\)/.*|pr-\1|')
+
+          # Ensure environment name is 11 characters or less and has no special characters    
+          env="${env:0:11}"
+          env=$(echo "$env" | sed 's/[^a-zA-Z0-9]/-/g')
+
+          terminus env:delete ${{ vars.SITE_NAME }}.$env --delete-branch --yes
\ No newline at end of file
diff --git a/README.md b/README.md
index c62bc11b..f47ec3db 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,8 @@
 # Intermediate GitHub Actions Workflow
 
 - contains automatic multidev deletion (separate job)
-- includes basic BackstopJS VRT (separate job)
\ No newline at end of file
+- includes basic BackstopJS VRT (separate job)
+
+## Multi-Dev Deletion
+
+A workflow is in place that checks for multi-devs associated to an open PR. If it detects a multi-dev, but there is no associated PR, said environment is removed.
\ No newline at end of file