Unable to build wails-cross image

[vladimmi]

It just fails with...

Step 11/23 : COPY <<'ZIGWRAP' /usr/local/bin/zcc-darwin-arm64
COPY failed: no source files were specified
  ERROR   task: Failed to run task "setup:docker": exit status 1

Is it anything on my side or is it just a broken docker image?

PS: Also issue template says bugs for v3 are not currently accepted (wails-cross is v3 feature, right?); and Discord URL listed in templates is highly suspicious because attempting to join it logs me out of Discord account on all devices and forces account re-verification. That doesn't really invite to touch Wails at all...

[hexvalid]

This looks like Docker's legacy builder encountering a COPY heredoc. The Step 11/23 output is a clue: <<'ZIGWRAP' starts an inline file in the Dockerfile, and needs a builder/frontend that supports that syntax.

First check that Buildx is available:

docker buildx version

Then, from the project directory, retry with BuildKit explicitly enabled (POSIX shell):

DOCKER_BUILDKIT=1 wails3 task setup:docker

If that reports a missing or broken Buildx component, install or repair the Buildx plugin. Docker documents how a missing Buildx component can cause older Docker installations to fall back to the legacy builder.

If an older BuildKit frontend still rejects the heredoc, put # syntax=docker/dockerfile:1 on the very first line of build/docker/Dockerfile.cross and retry. The COPY heredoc syntax is documented here.

This should address the specific COPY failed: no source files were specified error. If it persists, the output of docker version and docker buildx version would help narrow it down.