fix: look up app slug in list of Helm apps

[kelvintaywl]

⚙️ Issue

When the k8s namespace has more than 1 Helm app installed, the kots-exporter will fail since the following command will return multilines.

$ helm list -n circleci -o yaml | yq '.[].name'
circleci-server
helloworld

✅ Fix

I modified the yq command, using yq operators, to look up the list of Helm apps by name.
This fixes the case where the k8s namespace contains >1 Helm app.

• -e for --exit-status
• contains to look up an array: https://mikefarah.gitbook.io/yq/operators/contains
• strenv to load the $slug env var: https://mikefarah.gitbook.io/yq/operators/env-variable-operators#read-boolean-environment-variable-as-a-string

Context

$ helm list -n circleci -o yaml | yq '.[].name'
circleci-server
helloworld

Before

$ ./kots-exporter/kots-exporter.sh -n circleci
Script Path: /Users/kelvin/personal/kelvintaywl-server-scripts/kots-exporter


############ CHECKING REQUIRED ARGUMENTS ################
License Key String: asdjkla

############ SET DEFAULT VALUES ################

############ CHECKING K8S NAMESPACE and HELM RELEASE ################
------->> Error: Helm release circleci-server does not exist.
[1]    20279 terminated  ./kots-exporter/kots-exporter.sh -n circleci

After

$ ./kots-exporter/kots-exporter.sh -n circleci
Script Path: /Users/kelvin/personal/kelvintaywl-server-scripts/kots-exporter


############ CHECKING REQUIRED ARGUMENTS ################
License Key String: asdjkla

############ SET DEFAULT VALUES ################

############ CHECKING K8S NAMESPACE and HELM RELEASE ################

############ CREATING FOLDERS ################
output folder has been created.

############ DOWNLOADING HELM VALUE ################

Downloading helm value file from release: circleci-server and namespace: circleci
++++ Helm value file download has completed
....

• Tested Updating Existing Instance
• Installed on new instance

[ryanwohara]

Nice!