OS images: use "ref", "stream" and "version"

Switch azure default region to west us
Update find-image script to work with new API spec
Add version for every os image build
generate measurements: Use new API paths
CLI: config fetch measurements: Use image short versions to fetch measurements
CLI: allows shortnames to specify image in config
Image build pipeline: Change paths to contain "ref" and "stream"

internal/shortname/shortname_test.go

@@ -0,0 +1,102 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package shortname
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/goleak"
+)
+
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m)
+}
+
+func TestToParts(t *testing.T) {
+	testCases := map[string]struct {
+		shortname string
+		wantParts [3]string
+		wantErr   bool
+	}{
+		"only version": {
+			shortname: "v1.2.3",
+			wantParts: [3]string{"-", "stable", "v1.2.3"},
+		},
+		"stream and version": {
+			shortname: "stream/nightly/v1.2.3",
+			wantParts: [3]string{"-", "nightly", "v1.2.3"},
+		},
+		"full name": {
+			shortname: "ref/feat-xyz/stream/nightly/v1.2.3",
+			wantParts: [3]string{"feat-xyz", "nightly", "v1.2.3"},
+		},
+		"full name with extra slashes": {
+			shortname: "ref/feat-xyz//stream/nightly/v1.2.3",
+			wantErr:   true,
+		},
+		"invalid three part path": {
+			shortname: "invalid/invalid/invalid",
+			wantErr:   true,
+		},
+		"five part path": {
+			shortname: "invalid/invalid/invalid/invalid/invalid",
+			wantErr:   true,
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			assert := assert.New(t)
+			require := require.New(t)
+
+			ref, stream, version, err := ToParts(tc.shortname)
+			if tc.wantErr {
+				assert.Error(err)
+				return
+			}
+			require.NoError(err)
+			assert.Equal(tc.wantParts, [3]string{ref, stream, version})
+		})
+	}
+}
+
+func TestFromParts(t *testing.T) {
+	testCases := map[string]struct {
+		ref, stream, version string
+		wantShortname        string
+	}{
+		"only version": {
+			ref:           "-",
+			stream:        "stable",
+			version:       "v1.2.3",
+			wantShortname: "v1.2.3",
+		},
+		"stream and version": {
+			ref:           "-",
+			stream:        "nightly",
+			version:       "v1.2.3",
+			wantShortname: "stream/nightly/v1.2.3",
+		},
+		"full name": {
+			ref:           "feat-xyz",
+			stream:        "nightly",
+			version:       "v1.2.3",
+			wantShortname: "ref/feat-xyz/stream/nightly/v1.2.3",
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			assert := assert.New(t)
+
+			gotShortname := FromParts(tc.ref, tc.stream, tc.version)
+			assert.Equal(tc.wantShortname, gotShortname)
+		})
+	}
+}