feat: custom secret labels

[geekifier]

Description of changes

Support for user-defined labels on secrets generated from the PostgresUser resources

Motivation

labels are commonly used on Kubernetes resources, but currently only an app label is hardcoded by the operator.

Other Changes included in the PR

• Change e2e test to source the Helm chart install from current workdir instead of the upstream repo
• Bump the Helm chart version and app version reference
  • App version skips one release since chart was not updated in master for the current release tag (1.3.4).

Notes

I added some very basic tests for the PostgresUser.newSecretForCR function. There were no tests for that file.

It was a huge pain to get the e2e tests working due to the old SDK versions, which cannot be build on Apple silicon. The tests are now passing after I changed the Helm install to use the updated chart/CRDs. I added a basic check for the new label map in the secret (same should be probably done for annotations as well).

I am not a Go dev by any means, so please let me know if anything needs to be worked on.

Edit: Added testing resources in #173 (comment)

[geekifier]

Added testing resources:

Helm Repo: geekifier.github.io/postgres-operator
Docker Image: ghcr.io/geekifier/postgres-operator:1.3.5-test
Updated CRD: https://raw.githubusercontent.com/geekifier/postgres-operator/refs/heads/release/1.3.5-test/deploy/crds/db.movetokube.com_postgresusers_crd.yaml

# Provide following Helm values if using the chart
image:
  repository: ghcr.io/geekifier/postgres-operator
  tag: "1.3.5-test"

In addition to e2e, I tested on my k8s cluster and it worked as intended.

[pcallewaert]

Hey @geekifier, thank you for this PR. This looks great.
I'm aware of the outdated operator-sdk and the missing tests for the postgresuser controller. This is being tackled in #172 that hopefully will be ready in a few days/weeks. In the meanwhile I'll merge this and then I'll port your changes to the new SDK.

[pcallewaert]

🙌