Problem: Release process instructions for Docker Hub incomplete (#2407)

Solution: Expand the release process instructions for Docker Hub

RELEASE_PROCESS.md

@@ -51,7 +51,7 @@ The following steps are what we do to release a new version of _BigchainDB Serve
    - **Title:** Same as tag version above, e.g `v0.9.1`
    - **Description:** The body of the changelog entry (Added, Changed, etc.)
 1. Click "Publish release" to publish the release on GitHub.
-1. On your local computer, make sure you're on the `master` branch and that it's up-to-date with the `master` branch in the bigchaindb/bigchaindb repository (e.g. `git fetch upstream` and `git merge upstream/master`). We're going to use that to push a new `bigchaindb` package to PyPI.
+1. On your local computer, make sure you're on the `master` branch and that it's up-to-date with the `master` branch in the bigchaindb/bigchaindb repository (e.g. `git pull upstream master`). We're going to use that to push a new `bigchaindb` package to PyPI.
 1. Make sure you have a `~/.pypirc` file containing credentials for PyPI.
 1. Do `make release` to build and publish the new `bigchaindb` package on PyPI.
 1. [Log in to readthedocs.org](https://readthedocs.org/accounts/login/) and go to the **BigchainDB Server** project, then:
@@ -64,7 +64,11 @@ The following steps are what we do to release a new version of _BigchainDB Serve
      1. Make sure that the new version's tag is "Active" and "Public"
      1. Make sure the **stable** branch is _not_ active.
      1. Scroll to the bottom of the page and click the "Submit" button.
-1. Go to [Docker Hub](https://hub.docker.com/), sign in, go to bigchaindb/bigchaindb, and go to Settings --> Build Settings.
+1. Go to [Docker Hub](https://hub.docker.com/) and sign in, then:
+   - Click on "Organizations"
+   - Click on "bigchaindb"
+   - Click on "bigchaindb/bigchaindb"
+   - Click on "Build Settings"
    - Find the row where "Docker Tag Name" equals `latest`
      and change the value of "Name" to the name (Git tag)
      of the new release, e.g. `v0.9.0`.
@@ -73,5 +77,11 @@ The following steps are what we do to release a new version of _BigchainDB Serve
      You can do that by clicking the green "+" (plus) icon.
      The contents of the new row should be similar to the existing rows
      of previous releases like that.
+   - Click on "Tags"
+   - Delete the "latest" tag (so we can rebuild it)
+   - Click on "Build Settings" again
+   - Click on the "Trigger" button for the "latest" tag and make sure it worked by clicking on "Tags" again
+   - If the release is an Alpha, Beta or Release Candidate release,
+     then click on the "Trigger" button for that tag as well.
 
 Congratulations, you have released a new version of BigchainDB Server!