[Github] Move agent container to separate tar archive

This patch makes the build container job save the agent container image to a
separate tar file rather than bundling it in with the existing tar file. For
some reason, running podman save with two container images and then loading
that single tar file gets rid of the agent image and we end up with two
copies of the original image. This means that premerge jobs will fail with
the agent image because they cannot find the run.sh script.

.github/workflows/build-ci-container.yml

@@ -27,6 +27,7 @@ jobs:
       container-name-tag: ${{ steps.vars.outputs.container-name-tag }}
       container-name-agent-tag: ${{ steps.vars.outputs.container-name-agent-tag }}
       container-filename: ${{ steps.vars.outputs.container-filename }}
+      container-agent-filename: ${{ steps.vars.outputs.container-agent-filename }}
     steps:
       - name: Checkout LLVM
         uses: actions/checkout@v4
@@ -42,6 +43,7 @@ jobs:
           echo "container-name-tag=$container_name:$tag" >> $GITHUB_OUTPUT
           echo "container-name-agent-tag=$container_name-agent:$tag" >> $GITHUB_OUTPUT
           echo "container-filename=$(echo $container_name:$tag  | sed -e 's/\//-/g' -e 's/:/-/g').tar" >> $GITHUB_OUTPUT
+          echo "container-agent-filename=$(echo $container_name-agent:$tag  | sed -e 's/\//-/g' -e 's/:/-/g').tar" >> $GITHUB_OUTPUT
       - name: Build container
         working-directory: ./.github/workflows/containers/github-action-ci/
         run: |
@@ -53,13 +55,14 @@ jobs:
       # maintain minimal permissions while building the container.
       - name: Save container image
         run: |
-          podman save  ${{ steps.vars.outputs.container-name-tag }} ${{ steps.vars.outputs.container-name-agent-tag }} >  ${{ steps.vars.outputs.container-filename }}
+          podman save ${{ steps.vars.outputs.container-name-tag }}  >  ${{ steps.vars.outputs.container-filename }}
+          podman save ${{ steps.vars.outputs.container-name-agent-tag }} > ${{ steps.vars.outputs.container-agent-filename }}
 
       - name: Upload container image
         uses: actions/upload-artifact@v4
         with:
           name: container
-          path: ${{ steps.vars.outputs.container-filename }}
+          path: "*.tar"
           retention-days: 14
 
       - name: Test Container
@@ -92,6 +95,7 @@ jobs:
           podman push ${{ needs.build-ci-container.outputs.container-name-tag }}
           podman push ${{ needs.build-ci-container.outputs.container-name }}:latest
 
+          podman load -i ${{ needs.build-ci-container.outputs.container-agent-filename }}
           podman tag ${{ needs.build-ci-container.outputs.container-name-agent-tag }} ${{ needs.build-ci-container.outputs.container-name-agent }}:latest
           podman push ${{ needs.build-ci-container.outputs.container-name-agent-tag }}
           podman push ${{ needs.build-ci-container.outputs.container-name-agent }}:latest