Fix the OBS autosubmission (#936)

## Problem

- I added the `service/Rakefile` to extract the translations from the
Ruby files
- But I overlooked that there already is a top level `Rakefile` which
includes several adjustments to properly build the package

## Solution

- Use the top level `Rakefile`

.github/workflows/weblate-update-pot.yml

@@ -144,17 +144,17 @@ jobs:
 
       - name: Generate service POT file
         run: |
-          cd agama/service
+          cd agama
           rake pot
           msgfmt --statistics agama.pot
 
       - name: Validate the generated service POT file
-        run:  msgfmt --check-format agama/service/agama.pot
+        run:  msgfmt --check-format agama/agama.pot
 
       - name: Update service POT file
         run: |
           mkdir -p agama-weblate/service
-          cp agama/service/agama.pot agama-weblate/service/agama.pot
+          cp agama/agama.pot agama-weblate/service/agama.pot
 
       # any change besides the timestamp in the POT file?
       - name: Check service POT changes

.gitignore

@@ -1,3 +1,4 @@
 .log/
 .yardoc/
 .vscode/tasks.json
+/*.pot