Add Helm library chart with slugify template function for KlickTipp (#37)

Co-authored-by: Rainer 'rei' Schuth <rainer.schuth@digital-results-international.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: 3 people

charts/klicktipp.common/Chart.yaml

@@ -0,0 +1,6 @@
+apiVersion: v2
+name: klicktipp.common
+description: A Helm library chart for KlickTipp common templates
+type: library
+version: 0.1.0
+appVersion: "1.0.0"

charts/klicktipp.common/templates/_klicktipp.tpl

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+{{/*
+slugify the string to be (k8s) DNS name compatible
+*/}}
+{{- define "com.klicktipp.slugify-string" -}}
+{{- /* 1) Make sure we’re working with a string, and lowercase it */ -}}
+{{- $text := . | toString | lower -}}
+
+{{- /* 2) Replace “anything that is NOT a-z or 0-9” (in runs) with a dash */ -}}
+{{- $text = regexReplaceAll "[^a-z0-9]+" $text "-" -}}
+
+{{- /* 3) Remove dashes at the start or end */ -}}
+{{- $text = trimAll "-" $text -}}
+
+{{- /* 4) Limit to 63 characters, then remove a trailing dash if truncation created one */ -}}
+{{- $text = $text | trunc 63 | trimSuffix "-" -}}
+
+{{- /* 5) If nothing is left (e.g. input was only symbols), fail fast */ -}}
+{{- if eq $text "" -}}
+{{- fail "slugify: input became empty after sanitizing (must contain at least one a-z/0-9)" -}}
+{{- end -}}
+
+{{- /* Final: output the slug */ -}}
+{{- $text -}}
+{{- end -}}