[BE] Add optional step to upload coredumps

Test plan: cause a crash and make sure core is uploaded

Pull Request resolved: pytorch#74065
Approved by: https://github.com/janeyx99

.github/templates/common.yml.j2

@@ -309,6 +309,25 @@ concurrency:
             test-reports-*.zip
 {%- endmacro -%}
 
+{%- macro upload_cores(artifact_name="coredumps", config=None, shard=None, use_s3=True) -%}
+{%- if use_s3 %}- uses: !{{ upload_artifact_s3_action }}
+        name: Store Core dumps on S3
+{%- else %}- uses: actions/upload-artifact@v2
+        name: Store Core dumps on Github
+{%- endif %}
+        if: failure()
+        with:
+{%- if config != "" and shard != "" %}
+          name: !{{ artifact_name }}-!{{ config }}-!{{ shard }}
+{%- else %}
+          name: !{{ artifact_name }}
+{%- endif %}
+          retention-days: 14
+          if-no-files-found: ignore
+          path:
+            ./**/core.[1-9]*
+{%- endmacro -%}
+
 {%- macro render_test_results() -%}
       - name: Install render_test_results dependencies
         if: always()

.github/templates/linux_ci_workflow.yml.j2

@@ -339,6 +339,7 @@ jobs:
 {%- else %}
       !{{ common.upload_downloaded_files(name='linux', config=test_job.config, shard=test_job.shard, num_shards=test_job.num_shards, runner=test_job.runner) }}
       !{{ common.upload_test_reports(name='linux', config=test_job.config, shard=test_job.shard, num_shards=test_job.num_shards, runner=test_job.runner) }}
+      !{{ common.upload_cores(config=test_job.config, shard=test_job.shard) }}
 {%- endif %}
       !{{ common.upload_test_statistics(build_environment) }}
 {%- if 'rocm' in test_runner_type %}