fix: Bring back docker release notes

Docker image names were not being added to the release notes
because the Github release step was happening earlier in the
pipeline than the docker release itself (so no artifacts had
been added to the context). This patch re-orders the pipeline
and adds a comment to warn against this happening again.

Fixes: #846

internal/pipe/publish/publish.go

@@ -38,11 +38,13 @@ var publishers = []Publisher{
 	s3.Pipe{},
 	put.Pipe{},
 	artifactory.Pipe{},
-	release.Pipe{},
 	brew.Pipe{},
 	scoop.Pipe{},
 	docker.Pipe{},
 	snapcraft.Pipe{},
+	// This should be the last step in the pipeline to ensure that the
+	// release notes are complete.
+	release.Pipe{},
 }
 
 var bold = color.New(color.Bold)