Produce multi-arch docker images

[dgrove-oss]

We use a custom distDocker gradle task through the OpenWhisk project.

We should upgrade this task to support building/pushing proper multi-arch images (ie, both amd64 and arm64) to make it easier to develop OpenWhisk on modern Macs.

[dgrove-oss]

@shawnallen85 has a PR open for runtime-dotnet. After it merges and we verify the GitHub Actions are publishing multi-arch runtime-dotnet images as expected we can look into propagating the improvement across all of our runtime projects and applying it here too.

[shawnallen85]

https://hub.docker.com/r/openwhisk/action-dotnet-v6.0/tags

Looks like we have both arm64 and amd64 architectures published to docker hub.

[a-azqueta]

Hi, I'm trying to build openwhisk from github repository to create arm64 images, as I can't find them on the docker hub repository. Here I'm adding the link to the invoker component repository where you can see that no arm64 architecture is available: https://hub.docker.com/r/openwhisk/invoker/tags

I'm using openjdk 17 to build the images using the command ./gradlew distDocker and I'm getting the following error:

FAILURE: Build failed with an exception.

* Where:
Settings file 'openwhisk/settings.gradle'

* What went wrong:
Could not compile settings file 'openwhisk/settings.gradle'.
> startup failed:
  General error during semantic analysis: Unsupported class file major version 61

Same openjdk used in an amd64 arch machine and the ./gradlew distDocker command works.

I've also tried to compile for both architectures from the amd64 arch machine using the following command, but a docker.gradle check produces an error:

./gradlew distDocker -PdockerBinary='docker buildx' -PdockerBuildArgs='--platform linux/amd64,linux/arm64'
Build using Scala 2.12
Scala sub-project 'gatling_tests' doesn't have Scoverage applied and will be ignored in parent project aggregation

> Task :common:scala:distDocker FAILED
Fri Sep 05 14:34:59 CEST 2025: Executing 'docker buildx build --build-arg - --build-arg - --build-arg p --build-arg l --build-arg a --build-arg t --build-arg f --build-arg o --build-arg r --build-arg m --build-arg   --build-arg l --build-arg i --build-arg n --build-arg u --build-arg x --build-arg / --build-arg a --build-arg m --build-arg d --build-arg 6 --build-arg 4 --build-arg , --build-arg l --build-arg i --build-arg n --build-arg u --build-arg x --build-arg / --build-arg a --build-arg r --build-arg m --build-arg 6 --build-arg 4 -f openwhisk/common/scala/Dockerfile -t scala openwhisk/common/scala'

> Task :common:scala:tagImage FAILED

FAILURE: Build completed with 2 failures.

1: Task failed with an exception.
-----------
* Where:
Script 'openwhisk/gradle/docker.gradle' line: 149

* What went wrong:
Execution failed for task ':common:scala:distDocker'.
> java.io.IOException: Cannot run program "docker buildx": error=2, No such file or directory

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
==============================================================================

2: Task failed with an exception.
-----------
* Where:
Script 'openwhisk/gradle/docker.gradle' line: 122

* What went wrong:
Execution failed for task ':common:scala:tagImage'.
> java.io.IOException: Cannot run program "docker buildx": error=2, No such file or directory

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
==============================================================================

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.9.1/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 877ms
2 actionable tasks: 2 executed

This is due in docker.gradle' at line 122 it is checking the docker version, however as I've modified the dockerBinary binary from 'docker' to 'docker buildx' it is not possible to get the docker version.

Also, I've tried to modify the docker.gradle file but the General error during semantic analysis: Unsupported class file major version 61 appears with any simple modification, even adding a new blank line.

Is there any solution to compile the components for arm64 arch?

Any approach works for me, I can build the components for different architectures using 'docker buildx' command or I can build them on my mac M4.

Thank you in advance,

Ainhoa