Run a SSH session in the github actions container for better debugging

.github/workflows/tests.yml

@@ -64,7 +64,7 @@ jobs:
           sudo -u postgres createuser -s -d -r -w runner
         if: matrix.db-type == 'postgres'
 
-      #- name: Setup MySQL
+        #- name: Setup MySQL
       #  uses: mirromutth/mysql-action@v1.1
       #  with:
       #    mysql version: 5.7
@@ -154,5 +154,9 @@ jobs:
         env:
           DATABASE_URL: mysql://root:root@localhost:3306/legacy_db
 
+      - name: Setup tmate session
+        uses: mxschmitt/action-tmate@v3
+        if: ${{ failure() }}
+