[QUESTION]I'm having difficulty building a multi-arch image because the TARGETPLATFORM variable is not available in older buildah versions.

[daiaji]

containers/buildah@bee0a1f
Basically, it can be confirmed that the TARGETPLATFORM variable of buildah earlier than 1.26.0 is faulty.
But even the buildah version in the Ubuntu 22.04 software source is only 1.23.1.
This is obviously not enough, so I tried to install a higher version of buildah, but encountered difficulties.
actions/runner-images#2703 (comment)

sudo apt-get install -y buildah -o Dpkg::Options::="--force-overwrite"
But I'm lucky. This order works.
However, it may be necessary to inform this fault in the document.

Examples.
$ buildah build --platform linux/arm64 .

FROM --platform=$BUILDPLATFORM alpine
ARG TARGETPLATFORM
ARG BUILDPLATFORM
RUN echo "I'm compiling for $TARGETPLATFORM on $BUILDPLATFORM and tagging for $TARGETPLATFORM"

Wrong output.
I'm compiling for linux/amd64 on linux/amd64 and tagging for linux/amd64

Correct output.
I'm compiling for linux/arm64 on linux/amd64 and tagging for linux/arm64

[ramonsmits]

This isn't working for me either. I created the following runner request:

• Update/Add buildah actions/runner-images#10716

For me the issue is the TARGETARCH arg is not set by old versions.

The was a prior question about versions:

• [QUESTION] When is buildah updated? #77

I followed the advice from @tetchel to run an update script but that isn't working for me. I also tried the following but unfortunately no new version:

• https://gist.github.com/sebastianwebber/2c1e9c7df97e05479f22a0d13c00aeca?permalink_comment_id=4617569#gistcomment-4617569

[k9withabone]

I got Buildah working in a container after some trial and error. This let's you run the latest version. See the release-container workflow for Podlet. However, I haven't tried using this action with that setup.