refactor: integrate more probe-engine workflows (#204)

This diff is part of https://github.com/ooni/probe/issues/1335.

We are moving more probe-engine workflows to toplevel.

The general idea here is to migrate all possible workflows and to
delete the ones that we cannot use in this repo (if any).

.github/workflows/alltests.yml

@@ -0,0 +1,16 @@
+name: alltests
+on:
+  push:
+    branches:
+      - 'release/**'
+  schedule:
+    - cron: "0 7 * * */1"
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v1
+        with:
+          go-version: "1.14"
+      - uses: actions/checkout@v2
+      - run: go test -race -tags shaping ./...