Add new Github Action workflow to run govulncheck

This so we can disable dependabot on this project, that will generate
more false positives.

Author: koenbollen

.github/workflows/govulncheck.yaml

@@ -0,0 +1,18 @@
+name: govulncheck
+on:
+  pull_request:
+  schedule:
+    - cron: '22 10 * * *'
+  workflow_dispatch:
+permissions:
+  contents: read
+jobs:
+  govulncheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/setup-go@v6
+        with:
+          go-version: '1.25'
+      - run: |
+          go run golang.org/x/vuln/cmd/govulncheck@latest ./...