add CI workflow and coverage-gap validation tests

.github/workflows/e2e.yaml

@@ -0,0 +1,24 @@
+name: e2e-tests
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  e2e:
+    name: e2e
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/setup-go@v6
+        with:
+          go-version: 1.26.0
+          cache: true
+      - name: run e2e tests
+        run: go test ./e2e/... -v -count=1