Add govulncheck GH workflow

Runs on pull requests and daily at 06:23 UTC. The idea is to catch newly
disclosed vulnerabilities in our code.

Signed-off-by: Lucas Alvares Gomes <lucasagomes@gmail.com>

Author: umago

.github/workflows/govulncheck.yaml

@@ -0,0 +1,25 @@
+name: govulncheck
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  schedule:
+    - cron: '23 6 * * *'
+
+jobs:
+  govulncheck:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v7
+
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: "go.mod"
+
+      - name: Run govulncheck
+        run: make govulncheck