CI: fix external pull requests

Using github.repository does not
work for third-party pull requests.

Author: pjonsson

.github/workflows/main.yml

@@ -67,7 +67,7 @@ jobs:
   test-wheels:
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/${{ github.repository }}:latest
+      image: ghcr.io/opendatacube/odc-stats:latest
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/statistician-image.yml

@@ -2,6 +2,7 @@ name: Statistician Test and Push
 
 env:
   IMAGE_NAME: opendatacube/datacube-statistician
+  DOCKER_IMAGE: ghcr.io/opendatacube/odc-stats
 
 on:
   pull_request:
@@ -20,7 +21,6 @@ on:
     types:
       - completed
 
-
 permissions:
   id-token: write   # This is required for requesting the JWT
   contents: read    # This is required for actions/checkout
@@ -110,6 +110,6 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-          image_name: ${{ github.repository }}
+          image_name: ${{ env.DOCKER_IMAGE }}
           image_tag: latest,${{ needs.set_tags.outputs.image_tag }}
           build_extra_args: '{"--build-arg": "UPDATE_VERSION=${{ needs.set_tags.outputs.image_tag }}"}'