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If you have a feature request that is relevant to this repository, the runner, then please include the information below:

Describe the enhancement
If I have a local runner and a locally maintained docker image i.e. not stored on a repository, I would like to avoid the "docker pull" step, which then fails.

Code Snippet

name: Self Hosted Tests

on: [push]

jobs:
  integration_tests:
      runs-on: self-hosted
      container:
          image: python3.6:latest
      steps:
      - name: Checkout
        uses: actions/checkout@v2
      - name: What java version do we have
        run: java -version

Additional information
The image python3.6:latest is in my self-hosted runner's docker images. It doesn't exist in DockerHub or any other repository, and I don't want it to, because it should only ever be run on my self-hosted runner.

NOTE: if the feature request has been agreed upon then the assignee will create an ADR. See docs/adrs/README.md