Added workflow for automatic build number increase

.gitea/workflows/updateVersion.yml

@@ -0,0 +1,32 @@
+name: update version
+
+on:
+  push:
+    branches:
+      - develop
+
+jobs:
+  increment-build-number:
+    runs-on: ubuntu-latest
+    if: gitea.triggering_actor != 'ci'
+    steps:
+      - name: Pull & Checkout
+        uses: actions/checkout@v3
+        with:
+          ref: develop
+
+      - name: Bump build number
+        id: increase_build_number
+        uses: stikkyapp/update-pubspec-version@v1
+        with:
+          bump-build: true
+
+      - name: Push to develop
+        uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          file_pattern: pubspec.yaml
+          branch: develop
+          commit_user_name: ci
+          commit_user_email: elias@elias-mueller.com
+          commit_author: ci <elias@elias-mueller.com>
+          commit_message: Automatic build number bump to ${{ steps.increase_build_number.outputs.new-version }}