feat(common): Add .global.stopAll option to stop all on native Helm (#423)

**Description**
This implements a SCALE stop-button *like* experience on native helm.

This one actually works, in stark contrast to the iX stop-button
attempt:
- It uses helm, so helm edits don't magically start apps again (iX stop
button messes with objects managed by helm)
- It actually stops daemonsets (by only scheduling them on non-existing
nodes)
- It actually prevents (cron)jobs from running
- It hibernates cnpg clusters
- It can be expanded to as many custom objects as wel like/need in the
future

**⚙️ Type of change**

- [x] ⚙️ Feature/App addition
- [ ] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code

**🧪 How Has This Been Tested?**
<!--
Please describe the tests that you ran to verify your changes. Provide
instructions so we can reproduce. Please also list any relevant details
for your test configuration
-->

**📃 Notes:**
Can be abstracted away a bit (by putting an include in-between) to also
stop things prior to using the SCALE stop button, when iX ever exposes
that option.

**✔️ Checklist:**

- [x] ⚖️ My code follows the style guidelines of this project
- [x] 👀 I have performed a self-review of my own code
- [x] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [x] 📄 I have made corresponding changes to the documentation
- [x] ⚠️ My changes generate no new warnings
- [x] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
- [x] ⬆️ I increased versions for any altered app according to semantic
versioning

**➕ App addition**

If this PR is an app addition please make sure you have done the
following.

- [ ] 🪞 I have opened a PR on
[truecharts/containers](https://github.com/truecharts/containers) adding
the container to TrueCharts mirror repo.
- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`

---

_Please don't blindly check all the boxes. Read them and only check
those that apply.
Those checkboxes are there for the reviewer to see what is this all
about and
the status of this PR with a quick glance._

---------

Co-authored-by: Stavros Kois <47820033+stavros-k@users.noreply.github.com>

library/common-test/Chart.yaml

@@ -3,7 +3,7 @@ appVersion: ""
 dependencies:
 - name: common
   repository: file://../common
-  version: ~12.7.0
+  version: ~12.8.0
 deprecated: false
 description: Helper chart to test different use cases of the common library
 home: https://github.com/truecharts/apps/tree/master/charts/library/common-test

library/common/Chart.yaml

@@ -15,4 +15,4 @@ maintainers:
 name: common
 sources: null
 type: library
-version: 12.7.1
+version: 12.8.0

library/common/templates/class/_cnpgCluster.tpl

@@ -23,7 +23,7 @@ metadata:
   {{- end }}
   {{- $annotations := (mustMerge ($cnpgClusterAnnotations | default dict) (include "tc.v1.common.lib.metadata.allAnnotations" $ | fromYaml)) }}
   annotations:
-    cnpg.io/hibernation: {{ if $values.hibernate }}"on"{{ else }}"off"{{ end }}
+    cnpg.io/hibernation: {{ if or $values.hibernate $.Values.global.stopAll }}"on"{{ else }}"off"{{ end }}
   {{- with (include "tc.v1.common.lib.metadata.render" (dict "rootCtx" $ "annotations" $annotations) | trim) }}
     {{- . | nindent 4 }}
   {{- end }}

library/common/templates/class/_cnpgPooler.tpl

@@ -21,7 +21,7 @@ spec:
   cluster:
     name: {{ $cnpgClusterName }}
 
-  instances: {{ if $values.hibernate}}0{{ else }}{{ $values.pooler.instances | default 2 }}{{ end }}
+  instances: {{ if or $values.hibernate $.Values.global.stopAll }}0{{ else }}{{ $values.pooler.instances | default 2 }}{{ end }}
   type: {{ $values.pooler.type }}
   pgbouncer:
     poolMode: session

library/common/templates/lib/pod/_nodeSelector.tpl

@@ -20,10 +20,14 @@ objectData: The object data to be used to render the Pod.
     {{- $selectors = . -}}
   {{- end -}}
 
-  {{- range $k, $v := $selectors -}}
-    {{- if not $v -}}
-      {{- fail (printf "Expected non-empty value on <nodeSelector> [%s] key." $k) -}}
-    {{- end }}
+  {{-  if and $rootCtx.Values.global.stopAll ( eq $objectData.type "DaemonSet" ) -}}
+"non-existing": "true"
+  {{- else -}}
+    {{- range $k, $v := $selectors -}}
+      {{- if not $v -}}
+        {{- fail (printf "Expected non-empty value on <nodeSelector> [%s] key." $k) -}}
+      {{- end }}
 {{ $k }}: {{ tpl $v $rootCtx }}
+    {{- end -}}
   {{- end -}}
 {{- end -}}

library/common/templates/lib/workload/_cronjobSpec.tpl

@@ -20,6 +20,7 @@ concurrencyPolicy: {{ $objectData.concurrencyPolicy | default "Forbid" }}
 failedJobsHistoryLimit: {{ $objectData.failedJobsHistoryLimit | default 1 }}
 successfulJobsHistoryLimit: {{ $objectData.successfulJobsHistoryLimit | default 3 }}
 startingDeadlineSeconds: {{ $objectData.startingDeadlineSeconds | default 600 }}
+suspend: {{ if $rootCtx.Values.global.stopAll }}true {{ else }}{{ $objectData.suspend | default false }}{{ end }}
 jobTemplate:
   spec:
     {{- include "tc.v1.common.lib.workload.jobSpec" (dict "rootCtx" $rootCtx "objectData" $objectData) | indent 4 }}

library/common/templates/lib/workload/_deployementSpec.tpl

@@ -11,7 +11,7 @@ objectData:
   {{- $objectData := .objectData -}}
   {{- $rootCtx := .rootCtx -}}
   {{- $strategy := $objectData.strategy | default "Recreate" }}
-replicas: {{ $objectData.replicas | default 1 }}
+replicas: {{ if $rootCtx.Values.global.stopAll }}0{{ else }}{{ $objectData.replicas | default 1 }}{{ end }}
 revisionHistoryLimit: {{ $objectData.revisionHistoryLimit | default 3 }}
 strategy:
   type: {{ $strategy }}

library/common/templates/lib/workload/_jobSpec.tpl

@@ -16,7 +16,7 @@ objectData:
 backoffLimit: {{ $objectData.backoffLimit | default 5 }}
 completionMode: {{ $objectData.completionMode | default "NonIndexed" }}
 completions: {{ $objectData.completions | default nil }}
-parallelism: {{ $objectData.parallelism | default 1 }}
+parallelism: {{ if $rootCtx.Values.global.stopAll }}0{{ else }}{{ $objectData.parallelism | default 1 }}{{ end }}
 ttlSecondsAfterFinished: {{ $objectData.ttlSecondsAfterFinished | default 120 }}
   {{- with $objectData.activeDeadlineSeconds }}
 activeDeadlineSeconds: {{ . }}

library/common/templates/lib/workload/_statefulsettSpec.tpl

@@ -11,7 +11,7 @@ objectData:
   {{- $objectData := .objectData -}}
   {{- $rootCtx := .rootCtx -}}
   {{- $strategy := $objectData.strategy | default "RollingUpdate" }}
-replicas: {{ $objectData.replicas | default 1 }}
+replicas: {{ if $rootCtx.Values.global.stopAll }}0{{ else }}{{ $objectData.replicas | default 1 }}{{ end }}
 revisionHistoryLimit: {{ $objectData.revisionHistoryLimit | default 3 }}
 serviceName: {{ $objectData.name }}
 updateStrategy:

library/common/values.yaml

@@ -10,6 +10,9 @@ global:
   addTraefikAnnotations: true
   # -- Minimum nodePort value
   minNodePort: 9000
+  # -- Enable to stop most pods and containers including cnpg
+  # does not include stand-alone pods
+  stopAll: false
 
 fallbackDefaults:
   # -- Define a storageClassName that will be used for all PVCs