After the Dockerfile refactor into multi-stage (commit 6f975f87),
'docker build .' without --target selects the LAST stage of the
Dockerfile — which is blogs-runtime, an ASP.NET image with no
APK to extract. The subsequent docker cp command then fails
with:
Error: No such container:path: …PostIt.Android/bin/Release/
net10.0-android/android-arm64/com.CompanyName.PostIt-Signed.apk
Add --target build-env to scope the build to the build-env stage
(the one that produces both the .apk and the publish artifacts,
and which still ends with CMD ["bash"]).