fix: update repo counter with missing template

[jbrockopp]

Description

We had a user attempt to trigger the first build on a new repo in Vela with the following pipeline:

# For more details on templates, see the vela docs:
# https://go-vela.github.io/docs/templates/
# https://go-vela.github.io/docs/reference/yaml/templates/
# https://go-vela.github.io/docs/templates/tutorials/go/
# use the @branch-name override when testing
# templates:
#   - name: example
#     source: .vela.template.yml
#     type: file

stages:
  demo:
    steps:
      - name: demo
        template:
          name: example

NOTE: The demo step isn't valid because the example template is commented out.

So, when Vela went to create the build for the pipeline in the system, it led to this error shown on the Builds page:

NOTE: This error message is a bit misleading since a template is involved but that is a different problem.

The actual bug is that Vela didn't update the repo counter for this build leading to a broken state.

Without admin intervention, subsequent commits to the repo show this error on the Audit page:

This is because the counter is stuck at 0 for the repo while the actual number of builds for the repo is 1.

The workaround is to manually update the counter on the Settings page from 0 -> 1.

Value

A repo doesn't end up in a broken state that requires a repo or platform admin to resolve

Useful Information

1. What is the output of vela --version?

v0.20.3

2. What operating system is being used?

https://www.flatcar.org/

3. Any other important details?

N/A