I am building a small docker image of this way:

In my Dockerfile I am adding an specific configuration in etc/apache2/apache2.conf about redirect http to https rule:

Specifically this rule

<VirtualHost *:80>
RewriteEngine On
RewriteCond %{HTTP:X-Forwarded-Proto} =http
RewriteRule .* https://%{HTTP:Host}%{REQUEST_URI} [L,R=permanent]
</VirtualHost>

So, my Dockerfile is

FROM wordpress:5.2.4

RUN apt-get update && apt-get install -y \
    nano wget

COPY etc/apache2/apache2.conf /etc/apache2/apache2.conf

So, when it finish, I got two images in my local docker environment

REPOSITORY                   TAG      
customize_wordpress          5.2.4     
wordpress                    5.2.4

Being customize_wordpress:5.2.4 my personal image and wordpress:5.2.4 the base public image that I used at FROM instruction above in the Dockerfile

Like my purpose is upload my custom image customize_wordpress:5.2.4 to azure container registry, I am following this article in order to do it

I am doing the docker tag command of this way

docker tag customize_wordpress:5.2.4 registryname.azurecr.io/customize_wordpress:5.2.4

And it works. Also I push the image and it works as well

⟩ docker push registryname.azurecr.io/customize_wordpress:5.2.4
The push refers to repository [registryname.azurecr.io/customize_wordpress]
b63469233da6: Pushed 
b032b61b15b2: Pushed  
12fe3564ccac: Pushed 
4e9b2aba858c: Pushed 
b67d19e65ef6: Pushed 
5.2.4: digest: sha256:dc62844f946a49f2e724fa38bad6e2cab73a4561b22b690876ab5534febd3569 size: 5128
[I] 

So, I have these data as a environment variables in order to pass them to the helm command

export acr_login_server=registryname.azurecr.io
export acr_repository=customize_wordpress
export image_tag=5.2.4

But when I did the helm command

⟩ helm3 install  wordpress-site-4 ./Deployments/Kubernetes/HelmCharts/wordpress/  --set image.registry=$acr_login_server,image.repository=$acr_repository,image.tag=$image_tag,image.pullPolicy=Always,wordpressUsername=$wordpressUsername,wordpressPassword=$wordpressPassword,wordpressEmail=$wordpressEmail,mariadb.enabled=false,externalDatabase.host=$database_host,externalDatabase.user=$database_user,externalDatabase.password=$database_password,externalDatabase.database=$database_name,externalDatabase.port=3306

I could see in my kubernetes environment that the pod say that the image is not pulled. I got

Error response from daemon: pull access denied for customize_wordpress, repository does not exist or may require 'docker login': denied: requested access to the resource is denied
  Warning  Failed     2m20s (x4 over 3m39s)  kubelet, aks-defaultpool-34253081-vmss000001  Error: ErrImagePull

 Normal   Pulling    2m21s (x4 over 3m40s)  kubelet, aks-defaultpool-34253081-vmss000001  Pulling image "customize_wordpress:5.2.4"
  Warning  Failed     2m20s (x4 over 3m39s)  kubelet, aks-defaultpool-34253081-vmss000001  Failed to pull image "customize_wordpress:5.2.4": rpc error: code = Unknown desc = Error response from daemon: pull access denied for customize_wordpress, repository does not exist or may require 'docker login': denied: requested access to the resource is denied
  Warning  Failed     2m20s (x4 over 3m39s)  kubelet, aks-defaultpool-34253081-vmss000001  Error: ErrImagePull
  Normal   BackOff    114s (x6 over 3m38s)   kubelet, aks-defaultpool-34253081-vmss000001  Back-off pulling image "customize_wordpress:5.2.4"
  Warning  Failed     103s (x7 over 3m38s)   kubelet, aks-defaultpool-34253081-vmss000001  Error: ImagePullBackOff

I am doing this helm command from azure devops, and previously I logged in to my ACR of multiple ways such as:

echo "Log in to an Azure Container Registry"
# docker login $(acr_login_server) --username $(service_principal_name_ci-cd-app-id) --password $(service_principal_name_ci-cd-password)
az acr login --name $(acr_name) 

But the result is the same from the pod, I cannot pull the image

That's why I consider that I don't need to reference the docker registry secrets inside kubernetes and in the imagePullSecrets attribute in the helm chart values.yaml.

Despite everything I try to create that docker registry secret with my acr data but the result is the same as well.

How can I upload my customize image and pull it from Kubernetes?