[Feature] CI: Use imageCredentials to create the dockerregcred

[jbe99]

Description

At the moment, the Docker registry credential is created separately in the CI pipeline for installing the helm chart.
This should happen directly during the ct install with imageCredentials values.

Additional information

This is currently not possible because ct uses the same extra-args for the uninstall of the helm chart as for the install.
Since --set is invalid for uninstall, there is an error.

Used Code

ci.yaml

      - name: Create Secrets
        run: |
          kubectl cluster-info
          kubectl create secret generic microgatewaysecrets --from-literal=license="${{ secrets.WAF_LICENSE }}" --from-literal=passphrase="${{ secrets.WAF_PASSPHRASE }}"
      - name: Run chart-testing (install)
        run: ct install --config .github/ct.yaml --helm-extra-args "--set imageCredentials.username=${{ secrets.DOCKER_USER }} --set imageCredentials.password=${{ secrets.DOCKER_USER_TOKEN }}"

testing-values.yaml

config:
  generic:
    existingSecret: "microgatewaysecrets"
imageCredentials:
  enabled: true
redis:
  enabled: true
echo-server:
  enabled: true
ingress:
  enabled: true

Dependency:

helm/chart-testing#322

Checklist

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