--build-arg is not working for my docker build

Question

I am trying to add a custom NuGet repo to my docker image but I can't set credentials with --build-arg here my dockerfile

FROM mcr.microsoft.com/dotnet/sdk:7.0 AS build
WORKDIR /app
COPY . .
RUN dotnet nuget add source --username $USERNAME --store-password-in-clear-text --password $GITHUB_TOKEN --name notification "https://nuget.github.xxx.com/notification/index.json"
RUN dotnet restore
RUN dotnet publish -c Release -o /app/publish

FROM mcr.microsoft.com/dotnet/aspnet:7.0 AS runtime
WORKDIR /app
COPY --from=build /app/publish /app
ENTRYPOINT ["dotnet", "notification-api.dll"]
EXPOSE 80

I am trying to start build with this command.

docker build --build-arg GITHUB_TOKEN=my_token --build-arg USERNAME=my_user_name -t notification-api .

I also tried with curly braces like this ${GITHUB_TOKEN} but it keeps failing.

If I hardcode my username and token in dockerfile it works.

Does this answer your question? How to pass arguments to a Dockerfile? (specifically this linked section of the Docker docs: docs.docker.com/engine/reference/builder/#arg) — Gino Mempin
– Gino Mempin, Commented Dec 29, 2022 at 12:28

Mureinik · Accepted Answer · 2022-12-29 12:29:14Z

2

The Dockerfile needs to explicitly specify with the ARG instruction:

ARG USERNAME 
ARG GITHUB_TOKEN

answered Dec 29, 2022 at 12:29

Mureinik

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