fixup(httpd & mirrorbits-lite) remove all mocks from packaged chart

[dduportal]

This PR is a fixup of #817 and #818.

These past PRs did not break the current update-jenkins-io but the new feature to use global PVC/ingress from parent chart had some hiccups.

Namely, the mocks used for unit tests are packaged with the subchart and adding the pattern *mock* to the .helmignore results in unit test failing because, with the current 0.3.5 version of unit tests, it does not access files ignores by the.helmignore.

The result is, when trying on real life, the mocked templates takes over the expected template from the parent chart leading to unexpected results.

The proposed solution (2 commits, 1 per chart) proposes to use a combination of:

• An idea by @lemeurherve around passing the PVC name through the global value from parent chart to subchart. I've initially denied this proposal as using a static value forbids multiple installations of the chart (or at least makes it tedious to maintain).
• BUT I found this issue: Implement chart library testing helm-unittest/helm-unittest#171 about helm library chart tests which is the same kind of problem (mocking templates between charts). The proposed (hackish) solution uses the tpl engine to pass the template to underlying subcharts.

Tested in "production" with the helmfile diff and helm/helm#9987 and the results looks really well.

However I'm opening this in draft until we evaluate the risks of this solution as it could be (ab)used to extract credentials of the PVCs with helmfile diff (as this is a user input).

[dduportal]

OK, ready to review as I found a way to sanitize the tpl (using a combination of printf to force to a string, trimming to remove whitespaces around and then truncating to 63 chars as claimname must have this size).

[lemeurherve]

👏

[lemeurherve]

I didn't realize we could use templating in tests too, good to know!

[lemeurherve]

Not sure why you're not specifying "parent-chart-shared-data" directly though, what could be the other value than the default one here?

[dduportal]

I didn't realize we could use templating in tests too, good to know!

Neither did I until I realized that we can use the tpl function to pass custom data through values. Credits due to your idea which led me to helm-unittest/helm-unittest#171 where I learnt the trick.

⚠️ Remember that using values is dangerous for this (hence the sanitization of the rendered template to avoid user input garbage)

Not sure why you're not specifying "parent-chart-shared-data" directly though, what could be the other value than the default one here?

Oh I did it initially (and it works) but I wanted to show explicitly the fact that we can insert a template.