feat: test suffix and non-suffix variations

[glasnt]

By default, random_suffix is true, meaning all elements are created with -nnnn.

We should also ensure we test the single deployment-per-project option.

simple_example: no suffix
suffix_example: random suffixes

[glasnt]

re: bc5e861

I borrowed from https://github.com/GoogleCloudPlatform/terraform-google-secure-cicd/blob/main/build/int.cloudbuild.yaml#L31 to run the multiple tests, but unsure why there's waitFors that appear to only be in series, so trying without those for now.

[glasnt]

This can't be merged until #58, as I don't believe the TF will succeed without it.

[grayside]

waitFor in sequence is the same as no waitFor at all. However, looking closer at the terraform-google-secure-cicd config,

• everything waits for init-all to complete
• then there are two tracks that run in parallel:
  • Track 1: Sequentially: app_cicd, cloudbuild_private_pool, private_cluster_cicd
  • Track 2: standalone_single_project

Looking at the docs for waitFor:

If no values are provided for waitFor, the build step waits for all prior build steps in the build request to complete successfully before running.

On that basis, most of the waitFor configs could be removed, however if the "standalone_single_project" section were moved up in the file, it would break the parallelization of the build.

[glasnt]

This will be merged into #58, for testing completeness.