How to pass values to ARG in Dockerfile with az containerapp up

Question

I want to change the ARG value in the Dockerfile for each environment such as 'staging' and 'production' using az containerapp up.

For example, assume the following Dockerfile.

I want to specify the value of NODE_ENV in the 'app containerapp'.

FROM node:20.9

WORKDIR /projects/app

COPY ./package.json ./
COPY ./package-lock.json ./

RUN npm ci --production

COPY . .

ARG NODE_ENV

RUN npm run build -- --configuration ${NODE_ENV}

Answer 1

@dott-nagayama Looks like the command does not support this today. It would best to raise a feature request on the repo for Azure CLI to support this scenario.

That being said, this command internally uses ACR to build the image and the az acr build command supports passing build arguments. So, instead of using the az containerapp up command to build your image, you can first build it separately in your ACR and then call this command with the image name and registry details to create the containerapp.

While you need two commands to achieve the same, the time taken should not really be different since the az containerapp up command does the same internally, albeit with less flexibility.