GitHub Actions: Gradle JavaExec with dependency from build output

Question

I'm trying to run the main method of a class in my project as a Gradle task. The caveat is that this class has a dependency on a class that is generated by a different task(Netflix DGS generateJava)

It is my assumption that this should be as simple as adding a dependsOn:

task printJsonSchema(type: JavaExec) {
    dependsOn generateJava
    group = "Execution"
    description = "Run schema printer task"
    classpath = sourceSets.main.runtimeClasspath
    mainClass = 'com.company.xyz_api.utils.JsonSchemaGenerator'
}

And this task works fine when I run it locally but refuses to work from within a GitHub Actions which fails during the compile step.

Github Action Logs: (I tried to exclude all the junk but let me know if this isn't enough and I can try to get the full log attached)

Run ./gradlew printJsonSchema
...
> Task :xyz-api:generateJava
...
Build cache key for task ':xyz-api:generateJava' is eb70be25b6f69b5bd5dae98232698061
Task ':xyz-api:generateJava' is not up-to-date because:
  No history is available.
...
Stored cache entry for task ':xyz-api:generateJava' with cache key eb70be25b6f69b5bd5dae98232698061
...
:xyz-api:generateJava (Thread[included builds,5,main]) completed. Took 7.043 secs.
...
:xyz-api:compileJava (Thread[included builds,5,main]) started.
...
Build cache key for task ':xyz-api:compileJava' is 677850935e99c0573c6d0134967c67e2
Task ':xyz-api:compileJava' is not up-to-date because:
  No history is available.
The input changes require a full rebuild for incremental task ':xyz-api:compileJava'.
...
:xyz-api:compileJava (Thread[included builds,5,main]) completed. Took 55.844 secs.
import com.company.gen.xyzapi.types.DealInternal;
                                        ^
1 error
13 warnings

One of the things I've tried is trying to include the build folder in the classpath for the task but that doesn't seem to be related to compileJava failing

classpath = sourceSets.main.runtimeClasspath + files("xyz-api/build/generated/sources/dgs-codegen/com/company/gen/types")

action:

name: Run Gradle Task

on: [push]

jobs:
  gradle:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v2
      - name: Use JDK 17
        uses: actions/setup-java@v3
        with:
          distribution: 'temurin'
          java-version: 17
      - name: Run Gradle Task
        run: ./gradlew printJsonSchema
      - name: Store Schema File as ENV VAR
        id: generate_output_file
        run: |
          schema_json=$(cat xyz-api/schema.json)
          echo "$schema_json"  >> $GITHUB_OUTPUT