Merge bitcoin-core/secp256k1#1823: ci: Load Docker image by ID from builder step

ed02466d3f ci: Load Docker image by ID from builder step (Hennadii Stepanov)

Pull request description:

  Fixes loading wrong Docker images. For instance, see https://github.com/bitcoin-core/secp256k1/pull/1821#issuecomment-3899080578.

ACKs for top commit:
  real-or-random:
    utACK ed02466d3f

Tree-SHA512: 4de31bebe64d2b2adfbc5e1f2cbdea5e609a5640d17949bfe5aef9071948693ae7d8ac81772dd9620b101a72b553f38511b882119987e3c8342b6544571eca93

.github/actions/run-in-docker-action/action.yml

@@ -44,7 +44,7 @@ runs:
           $(echo '${{ toJSON(env) }}' | jq -r 'keys[] | "--env \(.) "') \
           --volume ${{ github.workspace }}:${{ github.workspace }} \
           --workdir ${{ github.workspace }} \
-          $(docker images -q | head -n1) \
+          ${{ case(steps.main_builder.outcome == 'success', steps.main_builder.outputs.imageid, steps.retry_builder.outputs.imageid) }} \
           bash -c "
             git config --global --add safe.directory ${{ github.workspace }}
             ${{ inputs.command }}