PMM-13077 list change log for PMM server version (#3045)

* Support release notes for PMM versions

This adds support for PMM release notes by fetching the correct markdown
files from github.

It also includes fixes for api tests by accepting v3 prefixes in
versions.

* use separate endpoint for listing versions

* replace dockerhub/github with version service endpoints

* fix tests

* use better naming for rpc

* drop todo

* use check dev for version service

* fix method name for changelogs

* include release notes text in response

api-tests/server/updates_test.go

@@ -71,6 +71,15 @@ func TestCheckUpdates(t *testing.T) {
 	assert.NotEmpty(t, res.Payload.Installed.FullVersion)
 
 	if res.Payload.UpdateAvailable {
+		require.NotEmpty(t, res.Payload.Latest)
+		assert.True(t, strings.HasPrefix(res.Payload.Latest.Version, "2.") || strings.HasPrefix(res.Payload.Installed.Version, "3."),
+			"latest.version = %q should have '2.' or '3.' prefix", res.Payload.Latest.Version)
+		require.NotEmpty(t, res.Payload.Latest.Timestamp)
+		ts = time.Time(res.Payload.Latest.Timestamp)
+		hour, min, _ = ts.Clock()
+		assert.Zero(t, hour, "latest.timestamp should contain only date")
+		assert.Zero(t, min, "latest.timestamp should contain only date")
+
 		assert.NotEmpty(t, res.Payload.Latest.Tag)
 		require.NotEmpty(t, res.Payload.Latest.Timestamp)
 		ts = time.Time(res.Payload.Latest.Timestamp)
@@ -81,6 +90,7 @@ func TestCheckUpdates(t *testing.T) {
 		assert.NotEqual(t, res.Payload.Installed.FullVersion, res.Payload.Latest.Version)
 		assert.NotEqual(t, res.Payload.Installed.Timestamp, res.Payload.Latest.Timestamp)
 		assert.True(t, strings.HasPrefix(res.Payload.LatestNewsURL, "https://per.co.na/pmm/2."), "latest_news_url = %q", res.Payload.LatestNewsURL)
+		assert.True(t, strings.HasPrefix(res.Payload.Latest.ReleaseNotesURL, "https://per.co.na/pmm/2."), "latest_news_url = %q", res.Payload.Latest.ReleaseNotesURL)
 	}
 	assert.NotEmpty(t, res.Payload.LastCheck)
 
@@ -110,6 +120,32 @@ func TestCheckUpdates(t *testing.T) {
 	})
 }
 
+func TestListUpdates(t *testing.T) {
+	const fast, slow = 5 * time.Second, 60 * time.Second
+
+	if !pmmapitests.RunUpdateTest {
+		t.Skip("skipping PMM Server check update test")
+	}
+
+	version, err := serverClient.Default.ServerService.Version(server.NewVersionParamsWithTimeout(fast))
+	require.NoError(t, err)
+	if version.Payload.Server == nil || version.Payload.Server.Version == "" {
+		t.Skip("skipping test in developer's environment")
+	}
+
+	params := &server.ListChangeLogsParams{
+		Context: pmmapitests.Context,
+	}
+	params.SetTimeout(slow)
+	res, err := serverClient.Default.ServerService.ListChangeLogs(params)
+	require.NoError(t, err)
+
+	if len(res.Payload.Updates) > 0 {
+		assert.True(t, strings.HasPrefix(res.Payload.Updates[0].Version, "3."),
+			"installed.version = %q should have '3.' prefix", res.Payload.Updates[0].Version)
+	}
+}
+
 func TestUpdate(t *testing.T) {
 	// do not run this test in parallel with other tests