Fix release version in footer

This has been broken since we moved to EKS and the SHA is no longer provided. We can use the [SENTRY_RELEASE](https://github.com/alphagov/govuk-helm-charts/blob/077117e7f40c096a958f9e0b853a2bd76cf43f26/charts/generic-govuk-app/templates/deployment.yaml#L92C1-L92C1) environment variable which is defined for every app and takes its value from the container image's tag. If for whatever reason the image tag is not defined it will display `null`, which should make it clearer (instead of displaying `development`) that this data is not being pulled in successfully.
alphagov · Sep 27, 2023 · a52a8fd · a52a8fd
1 parent c6a9630
commit a52a8fd
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diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
@@ -50,7 +50,7 @@
   </div>
 <% end %>
 
-<% content_for :footer_version, CURRENT_RELEASE_SHA %>
+<% content_for :footer_version, ENV.fetch("SENTRY_RELEASE", "null")[0..18] %>
 
 <% content_for :body_end do %>
   <%= javascript_include_tag "application" %>

diff --git a/config/initializers/current_release_sha.rb b/config/initializers/current_release_sha.rb