Hey I was wondering how to setup docker build with github actions just to see if my code actually compiles. It currently errors out with this

When using COPY with more than one source file, the destination must be a directory and end with a /

however if I add a

/

to the end of the copy statement it stops building locally. Here's the Dockerfile

FROM gradle as build
COPY --chown=gradle:gradle . /home/gradle/src
WORKDIR /home/gradle/src
RUN gradle buildFatJar --no-daemon

FROM openjdk:17
EXPOSE 8080:8080

RUN mkdir /app
COPY --from=build /home/gradle/src/build/libs/*.jar /app/ktor-app.jar
ENTRYPOINT ["java", "-jar", "/app/ktor-app.jar"]

Not sure if this wouldn't work for you, but there is https://ktor.io/docs/docker.html This uses a plugin which delegates to

jib

https://github.com/GoogleContainerTools/jib to build your container instead of using a Dockerfile. This adds gradle tasks to build and run the container

Alternatively, this is a Dockerfile that works: https://gitlab.com/opensavvy/formulaide/-/blob/main/.gitlab/backend.dockerfile Just run

./gradlew assembleDist

before building it

Does it work with GitHub actions? That’s the main problem I’m experiencing at the moment

It's just a Dockerfile, it runs in whatever runs a Dockerfile

With the error message I stated above that only occurs with GitHub actions however locally it’s fine, it’s weird

Old version of Docker in one of the two envs?

Perhaps, let me quickly check my local docker version

using the ktor jib plugin builds without issue on github actions for me

Yeah that's the copy that isn't working, do you by chance have a solution to that or just recommend me to use jib?

using the ktor docker plugin would most likely be easiest tbh unless you really want to learn dockerfiles

Interesting, I'll try it out thank you so much.