ci: add tmate for easier debug

.github/workflows/deploy_push.yml

@@ -7,6 +7,13 @@ on:
       - 'html/**'
       - '.github/workflows/deploy_push.yml'
       - 'requirements.txt'
+  workflow_dispatch:
+    inputs:
+      debug_enabled:
+        type: boolean
+        description: 'Run the build with tmate debugging enabled (https://github.com/marketplace/actions/debugging-with-tmate)'
+        required: false
+        default: false
 jobs:
   deploy:
     runs-on: ubuntu-latest
@@ -20,6 +27,10 @@ jobs:
       GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
       TFE_TOKEN: ${{ secrets.TFE_TOKEN }}
     steps:
+      - name: Setup tmate session
+        uses: mxschmitt/action-tmate@v3
+        if: ${{ github.event_name == 'workflow_dispatch' && inputs.debug_enabled }}
+
       - name: Configure AWS credentials
         uses: aws-actions/configure-aws-credentials@67fbcbb121271f7775d2e7715933280b06314838 # ratchet:aws-actions/configure-aws-credentials@v1
         with: