add debugging with tmate

.github/workflows/maven-snapshot.yml

@@ -3,6 +3,13 @@ on:
     push:
         branches:
             - main
+  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:
     publish:
         runs-on: ubuntu-latest
@@ -34,3 +41,7 @@ jobs:
               env:
                   MAVEN_USERNAME: ${{ secrets.DATAVERSEBOT_SONATYPE_USERNAME }}
                   MAVEN_PASSWORD: ${{ secrets.DATAVERSEBOT_SONATYPE_TOKEN }}
+              # 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 }}