Adjusted build scripts to make use of submodules

Author: ChristianH99

.github/workflows/build_entry_rules.yml

@@ -11,8 +11,12 @@ jobs:
   build:
     name: build entry 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 entry rules
         run: |

.github/workflows/build_main_rules.yml

@@ -7,7 +7,6 @@ on:
       - 'preamble.tex'
       - 'committee_list.tex'
 
-
 jobs:
   build:
     name: build main rules