refactor: remove old CI workflows and consolidate into a new test workflow

.gitea/workflows/test-pr.yaml

@@ -0,0 +1,23 @@
+name: CI
+on:
+  - pull_request
+
+jobs:
+  check-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: 'go.mod'
+      - name: tidy
+        run: go mod tidy  
+      - name: lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          args: -D errcheck
+          version: latest
+      - name: build
+        run: go build ./...
+      - name: test
+        run: go test -race -v -shuffle=on ./...