[helm/jenkins] Support multiple Jenkins instances in same namespace (#12748)

* use release name as part of CasC confimap label

Signed-off-by: Torsten Walter <mail@torstenwalter.de>

* rename jcasc_config.yaml to jcasc-config.yaml

All other ressources use dashes as separators instead of underscores.
Renamed the file to harmonize file names.

Signed-off-by: Torsten Walter <mail@torstenwalter.de>

* prefix config map with release name

Having the release name as prefix istead suffix makes it easier to
sort config maps for multiple releases e.g.:

```
$ kubectl get configmap
NAME                                      DATA   AGE
jenkins1                                  6      43m
jenkins1-jenkins-config-welcome-message   1      43m
jenkins1-tests                            1      43m
jenkins2                                  6      34m
jenkins2-jenkins-config-welcome-message   1      34m
jenkins2-tests                            1      34m
```

Signed-off-by: Torsten Walter <mail@torstenwalter.de>

* bumped char version

Signed-off-by: Torsten Walter <mail@torstenwalter.de>

stable/jenkins/Chart.yaml

@@ -1,6 +1,6 @@
 name: jenkins
 home: https://jenkins.io/
-version: 0.36.5
+version: 0.37.0
 appVersion: lts
 description: Open source continuous integration server. It supports multiple SCM tools
   including CVS, Subversion and Git. It can execute Apache Ant and Apache Maven-based

stable/jenkins/templates/jcasc-config.yaml

@@ -5,8 +5,9 @@
 apiVersion: v1
 kind: ConfigMap
 metadata:
-  name: jenkins-config-{{ template "jenkins.fullname" $root }}-{{ $key }}
+  name: {{ template "jenkins.fullname" $root }}-jenkins-config-{{ $key }}
   labels:
+    {{ template "jenkins.fullname" $root }}-jenkins-config: "true"
     {{ $.Values.Master.Sidecars.configAutoReload.label | default "jenkins_config" }}: "true"
     release: {{ $root.Release.Name }}
     chart: "{{ $root.Chart.Name }}-{{ $root.Chart.Version }}"

stable/jenkins/templates/jenkins-master-deployment.yaml

@@ -272,7 +272,7 @@ spec:
             - name: JENKINSRELOADCONFIG
               value: "true"
             - name: LABEL
-              value: "{{ .Values.Master.Sidecars.configAutoReload.label }}"
+              value: "{{ template "jenkins.fullname" . }}-jenkins-config"
             - name: FOLDER
               value: "{{ .Values.Master.Sidecars.configAutoReload.folder }}"
             - name: NAMESPACE

stable/jenkins/values.yaml

@@ -205,8 +205,6 @@ Master:
       # accessible via SSH from outside of the pod.  Note if you use non-root pod privileges (RunAsUser & FsGroup),
       # this must be > 1024:
       sshTcpPort: 1044
-      # label that the configmaps with dashboards are marked with:
-      label: jenkins_config
       # folder in the pod that should hold the collected dashboards:
       folder: /var/jenkins_home/casc_configs
       # If specified, the sidecar will search for dashboard config-maps inside this namespace.