Remove workflow as it is not working

.gitea/workflows/main.yaml

@@ -1,21 +0,0 @@
-name: Gitea Actions Demo
-run-name: Build-Test bannertool
-on: [push]
-
-jobs:
-  linux-test:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Build
-        run: |
-          apt update -y
-          apt install build-essential cmake -y
-          cmake -B cmake-build-debug
-          cmake --build cmake-build-debug
-      - name: upload artifact 
-        uses: actions/upload-artifact@v2
-        with:
-          name: bannertool
-          path: cmake-build-debug/bannertool