bazel: deps mirror (#1522)

bazel-deps-mirror is an internal tools used to upload external dependencies
that are referenced in the Bazel WORKSPACE to the Edgeless Systems' mirror.

It also normalizes deps rules.

* hack: add tool to mirror Bazel dependencies
* hack: bazel-deps-mirror tests
* bazel: add deps mirror commands
* ci: upload Bazel dependencies on renovate PRs
* update go mod
* run deps_mirror_upload


Signed-off-by: Paul Meyer <49727155+katexochen@users.noreply.github.com>
Co-authored-by: Paul Meyer <49727155+katexochen@users.noreply.github.com>

hack/bazel-deps-mirror/internal/issues/issues_test.go

@@ -0,0 +1,46 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package issues
+
+import (
+	"bytes"
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"go.uber.org/goleak"
+)
+
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m)
+}
+
+func TestMap(t *testing.T) {
+	assert := assert.New(t)
+
+	m := New()
+	assert.Equal(0, len(m))
+	assert.False(m.FileHasIssues("file1"))
+	m.Set("file1", map[string][]error{
+		"rule1": {errors.New("r1_issue1"), errors.New("r1_issue2")},
+		"rule2": {errors.New("r2_issue1")},
+	})
+	assert.Equal(3, m.IssuesPerFile("file1"))
+	assert.True(m.FileHasIssues("file1"))
+
+	// let report write to a buffer
+	b := new(bytes.Buffer)
+	m.Report(b)
+	rep := b.String()
+	assert.Equal(rep, `File file1 (3 issues total):
+  Rule rule1 (2 issues total):
+    r1_issue1
+    r1_issue2
+  Rule rule2 (1 issues total):
+    r2_issue1
+`)
+}