Add GitHub workflow for pull requests

.github/workflows/pull_request.yaml

@@ -0,0 +1,44 @@
+name: Pull Request
+
+on:
+  pull_request:
+
+jobs:
+  check-go:
+    name: Ensure Go modules synchronicity
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Setup Golang
+        uses: actions/setup-go@v5
+        with:
+          go-version: 1.24.x
+          cache: false
+      - name: Download all Go modules
+        run: |
+          go mod download
+      - name: Check for tidiness of go.mod and go.sum
+        run: |
+          go mod tidy
+          git diff --exit-code -- .
+
+  lint-go:
+    name: Lint Go code
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: read
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Setup Golang
+        uses: actions/setup-go@v5
+        with:
+          go-version: 1.24.x
+          cache: false
+      - name: Run golangci-lint
+        uses: golangci/golangci-lint-action@v8
+        with:
+          version: v2.3.0
+          args: --verbose