chore: remove obsolete Docker build workflow file

.gitea/workflows/bun.yml

@@ -1,38 +0,0 @@
-name: Build Docker Image
-
-on:
-  push:
-    paths:
-      - frontend/package.json
-      - frontend/bun.lock
-      - .gitea/bunPipeline/Dockerfile
-
-jobs:
-  build:
-    runs-on: vps-4
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Login to Docker.io Registry
-        uses: https://git.kjan.de/actions/login-action@v3 # v3
-        with:
-          registry: git.simonis.lol
-          username: ${{ vars.DOCKER_USER }}
-          password: ${{ vars.DOCKER_PW }}
-
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
-        with:
-          context: frontend
-          file: .gitea/bunPipeline/Dockerfile
-          push: true
-          tags: git.simonis.lol/projects/bun-casino:latest # Change this to your repo
-          cache-from: type=registry,ref=git.simonis.lol/projects/bun-casino:latest
-          cache-to: type=inline