Adding checkout of submodule to workflow

Author: ChristianH99

.github/workflows/build_main_rules.yml

@@ -12,8 +12,12 @@ jobs:
   build:
     name: build main rules
     runs-on: ubuntu-20.04
+
     steps:
-      - uses: actions/checkout@v2
+      - name: Checkout repository with submodules
+        uses: actions/checkout@v2
+        with:
+          submodules: true
 
       - name: build main rules
         run: |

onstage_rules/rules.adoc

@@ -61,8 +61,6 @@ From 2021 onwards, there will be no sub-leagues in RoboCupJunior OnStage.
 |image:media/OnStage/StagePerfRight.jpg[width=230]
 |===
 
-//test
-
 [[general-rules]]
 include::general-rules.adoc[]