fusion-core | Migrated to https : //github.com/fusionjs/fusionjs | Data Migration library

I am using Jenkins to build and deploy a .Net Core microservice application. For each microservice, I am building a docker container. My dockerfile has the following in it:

ARG source

COPY ${source:-obj/Docker/publish} .

Prior to upgrading from .Net Core 2.2 to 3.1, this worked. After the upgrade, when I try to deploy, I am getting the following error:

COPY failed: stat /var/lib/docker/tmp/docker-builder609391151/obj/Docker/publish: no such file or directory script returned exit code 1

From what I've read, it looks like .Net Core 2.2 compiled into the /obj/Docker/publish directory, but .Net Core 3.1 compiles into the /bin/Release/netcoreapp3.1 directory, however the source is still pointing to /obj/Docker/publish. I'm trying to figure out where the source arguement is defined, and how I should change this.

Update:

I decided to leave the source out entirely and hard-code the build path. I changed the copy line to

COPY /var/lib/jenkins/jobs/fusion-core/branches/master/workspace/src/CustomerAPI/obj/Release/netcoreapp3.1 .

I'm still getting an error when I try to build the docker container that says

COPY failed: stat /var/lib/docker/tmp/docker-builder356954794/var/lib/jenkins/jobs/fusion-core/branches/master/workspace/src/CustomerAPI/obj/Release/netcoreapp3.1: no such file or directory script returned exit code 1

I'm not sure where the "/var/lib/docker/tmp/docker-builder356954794" is coming from, or why it is appending it to the front of my path, but it doesn't exist.

Still not sure how to get around this.