ci: run osv-linter tests (#297)

This setups up a workflow for running the `osv-linter` tests for pull
requests - it looks like there are also tests for the Python-based
tools, which I'll look into as a follow up.

This'll make it easier to later add CI for #292

Signed-off-by: Gareth Jones <jones258@gmail.com>

.github/workflows/checks.yml

@@ -0,0 +1,39 @@
+name: Checks
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [main]
+
+concurrency:
+  # Pushing new changes to a branch will cancel any in-progress CI runs
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+# Restrict jobs in this workflow to have no permissions by default; permissions
+# should be granted per job as needed using a dedicated `permissions` block
+permissions: {}
+
+jobs:
+  tests_osv-linter:
+    permissions:
+      contents: read # to fetch code (actions/checkout)
+    name: Run unit tests
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./tools/osv-linter
+    steps:
+      - name: Check out code
+        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+        with:
+          persist-credentials: false
+      - name: Set up Go
+        uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
+        with:
+          go-version: stable
+          check-latest: true
+
+      - run: go test ./...