Add note on bundle structure and format (#74)

* Add note on bundle structure and format

* Add links into wg-easy examples

Author: hedge-sparrow

patterns/support-bundles/README.md

@@ -0,0 +1,84 @@
+# Support bundles in helm charts
+
+A quick note on structure and formatting for support bundles in helm charts
+
+## structure
+
+Each helm chart in your release should contain a support bundle spec that collects and analyzes resources that are installed by that chart.
+
+If you're installing a helm chart from an upstream project that doesn't supply their own support bundles, you can include it as a sub-chart of a wrapper inside your release:
+
+```
+  app-workspace
+  ├─ cert-manager-HelmChart.yaml
+  ├─ cert-manager
+  ┊  ├─ Chart.yaml
+     └─ templates
+        ├─ _supportbundle.tpl
+        ├─ secret-supportbundle.yaml
+        ┊
+```
+
+`cert-manager-HelmChart.yaml`
+```yaml
+apiVersion: kots.io/v1beta2
+kind: HelmChart
+metadata:
+  name: cert-manager
+spec:
+  chart:
+    name: cert-manager
+```
+
+`Chart.yaml`
+```yaml
+name: cert-manager
+apiVersion: v2
+version: 1.0.0
+dependencies:
+  - name: cert-manager
+    version: '1.14.5'
+    repository: https://charts.jetstack.io
+```
+
+You can see examples of this wrapper chart structure:
+- [Wrapped cert-manager chart](https://github.com/replicatedhq/platform-examples/tree/main/applications/wg-easy/charts/cert-manager)
+- [Wrapped traefik chart](https://github.com/replicatedhq/platform-examples/tree/main/applications/wg-easy/charts/traefik)
+
+## formatting
+
+To ease writing support bundles inside a secret, we can use a simple template `include` pattern to avoid having to write nested yaml structures.
+
+`templates/secret-supportbundle.yaml`
+```yaml
+apiVersion: v1
+kind: Secret
+metadata:
+  name: cert-manager-supportbundle
+  labels:
+    troubleshoot.sh/kind: support-bundle
+type: Opaque
+stringData:
+  support-bundle-spec: |
+{{ include "cert-manager.supportbundle" . | indent 4 }} 
+```
+
+`templates/_supportbundle.tpl`
+```yaml
+{{- define "cert-manager.supportbundle" -}}
+apiVersion: troubleshoot.sh/v1beta2
+kind: SupportBundle
+metadata:
+  name: cert-manager-supportbundle
+spec:
+  collectors:
+    - logs:
+        namespace: {{ .Release.Namespace }}
+        selector:
+        - app.kubernetes.io/instance=cert-manager
+{{- end -}} 
+```
+
+Some further examples can be found:
+- [Traefik support bundles and preflights](https://github.com/replicatedhq/platform-examples/tree/main/applications/wg-easy/charts/traefik/templates)
+- [cert-manager support bundles and preflights](https://github.com/replicatedhq/platform-examples/tree/main/applications/wg-easy/charts/cert-manager/templates)