feat: add end-to-end testing to this repository (#220)

* feat: add end-to-end testing to this repository

Part of https://github.com/ooni/probe-engine/issues/1181

Motivation: we want to run this check from the repository where
we work the most, such that it's unlikely it pauses due to inactivity,
as it may happen for less frequently touched upon repositories.

Code adapted from https://github.com/ooni/e2etesting/

* fix: correct name for main branch

E2E/.gitignore

@@ -0,0 +1 @@
+/*.jsonl

E2E/README.md

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+# github.com/ooni/probe-cli/E2E
+
+This directory is used to run end-to-end tests where we run specific
+measurements, we fetch them back from the API, and check them.

E2E/miniooni.bash

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+#!/bin/bash
+set -e
+go build -v ./internal/cmd/miniooni
+probeservices=()
+probeservices+=( "https://ps1.ooni.io" )
+probeservices+=( "https://dvp6h0xblpcqp.cloudfront.net" )
+probeservices+=( "https://ams-pg-test.ooni.org" )
+for ps in ${probeservices[@]}; do
+    opt="-o E2E/o.jsonl --probe-services=$ps"
+    set -x
+    ./miniooni --yes $opt -i http://mail.google.com web_connectivity
+    ./miniooni --yes $opt tor
+    ./miniooni --yes $opt psiphon
+    set +x
+done
+set -x
+go run ./internal/cmd/e2epostprocess -expected 9
+set +x