Remote docker build fails

Thanks for the replies guys. The image is based on:

FROM python:3.11-slim as python-base

I ended up moving the whole thing over into GH actions (where it truly belongs, tbh). Sharing my workflow code for the posterity:

name: Fly Images
on:
  push:
    paths:
      - "server/workers/**"
jobs:
  tests:
    runs-on: ubuntu-latest
    name: Run tests
    steps:
      - uses: actions/checkout@v4

      - name: Run tests
        working-directory: "server/workers"
        run: docker build --no-cache --target test .
  deploy:
    name: Build and push worker image
    needs: tests
    runs-on: ubuntu-latest
    concurrency: deploy-group
    env:
      FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}
    steps:
      - uses: actions/checkout@v4
      - uses: superfly/flyctl-actions/setup-flyctl@master
      - name: Auth Fly Docker
        run: flyctl auth docker
      - name: Build docker image
        working-directory: "server/workers"
        run: docker build -t registry.fly.io/IMAGE_NAME_HERE:latest .
      - name: Push docker image
        run: docker push registry.fly.io/IMAGE_NAME_HERE:latest