Build and push the hourly billing agent ubbagent

[maelvls]

Closes #7.

I simply clone the GoogleCloudPlatform/ubbagent repo and built the image using the given ./Dockerfile in our cloudbuild.yml. The image is then pushed to:

# I use my own project, jetstack-mael-valais, for testing: 
gcr.io/jetstack-mael-valais/ubbagent:1.1.0

Since we just need the basic hourly reporting in the first iteration, I think it's OK not to fork it right away (no need to customize it at the moment).

[wallrj]

A couple of comments and questions, but please merge at will.

[wallrj]

I wondered if these commands could all be executed in a single step, assuming that the gcr.io/cloud-builders/gcloud has the docker cli tools.
It might simplify the (already rather long) cloud-build.yaml.

But happy for this to be merged now, if you prefer it this way.

[wallrj]

And another question is whether we can pull / tag and push an existing image, rather than building from scratch?
Or even whether we need to pull and push this image, if by chance it is already hosted on the marketplace gcr registry.
These are just idle thoughts. Ignore them if you want to just get this merged.

[maelvls]

sure, i would be happy to justn one single step instead of scattering in 3 different steps

[maelvls]

And another question is whether we can pull / tag and push an existing image, rather than building from scratch?

I was unable to find a blessed image on gcr.io unfortunately, I searched everywhere but could not find anything :(

[maelvls]

Looks like the gcloud doesnt have docker 😞

Step #12 - "build-ubbagent": + git clone https://github.com/GoogleCloudPlatform/ubbagent --branch 0.0.1
Step #12 - "build-ubbagent": + docker build --tag gcr.io/jetstack-mael-valais/cert-manager/ubbagent:1.1.0 ./ubbagent
Step #12 - "build-ubbagent": bash: line 1: docker: command not found

[maelvls]

Oops, some of my latest changes broke build-ubbagent

Step #15 - "build-deployer": mv: target 'chart' is not a directory
Step #15 - "build-deployer": The command '/bin/sh -c cd /tmp         && mv chart.tmp/* chart         && tar -czvf /tmp/chart.tar.gz chart         && mkdir -p /data/chart         && mv chart.tar.gz /data/chart/         && rm -Rf chart chart.tmp' returned a non-zero code: 1
Finished Step #15 - "build-deployer"
ERROR
ERROR: build step 15 "gcr.io/cloud-builders/docker" failed: step exited with non-zero status: 1

[maelvls]

Fixed!

I had to move the preflight folder to the chart/jetstacksecure-mp/charts, that's what was causing the failure; the tar command expected a single folder but was receiving multiple ones 😅

/unassign
/assign @wallrj

[wallrj]

/lgtm

Thanks @maelvls