Remove the placeholder test.yml workflow

It set container: gitea/gitea:latest, which has no node - actions/checkout
fails immediately with "node: executable file not found" (confirmed via
tea actions runs logs 102 on the live instance: conclusion failure, 15s).
ci.yml replaces it - same go test coverage plus sqlc/web/docker, and no
container override, so it uses the runner's normal image instead of the
Gitea server's own image.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitea/workflows/test.yml

@@ -1,19 +0,0 @@
-name: test
-on:
-  push:
-    branches:
-      - main
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    container: gitea/gitea:latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Set up Go
-        uses: actions/setup-go@v5
-        with:
-          go-version: '1.22'
-      - name: Install dependencies
-        run: go mod download
-      - name: Run tests
-        run: go test ./...