CI: add a workflow option for tmate debugging

Signed-off-by: Sven Anderson <sven@redhat.com>

.github/workflows/main.yml

@@ -13,6 +13,13 @@ on:
       - 'pr/**'
   schedule:
     - cron: 1 1 * * *
+  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:
   # Determine the latest go versions
@@ -80,6 +87,10 @@ jobs:
       run:  sudo bash -c 'echo "core" > /proc/sys/kernel/core_pattern'
     - name: Run tests
       run: make test-containers-test "CEPH_VERSION=${{ matrix.ceph_version }}" "GO_VERSION=${{ matrix.go_version }}" "RESULTS_DIR=$PWD/_results"
+    # Enable tmate debugging of manually-triggered workflows if the input option was provided
+    - name: Setup tmate session
+      uses: mxschmitt/action-tmate@v3
+      if: ${{ github.event_name == 'workflow_dispatch' && inputs.debug_enabled }}
     - name: Clean up test containers
       if: always()
       run: make test-containers-clean "CEPH_VERSION=${{ matrix.ceph_version }}"