Add retry workflow for Captum OSS GitHub Actions (#1408)

Summary:
Pull Request resolved: #1408

We frequently see sporadic failures in Captum GitHub actions test workflows, often related to package download, http errors, conda environment setup, etc.

We add auto-retries to automatically retry failed workflows rather than needing to do this manually.

Reviewed By: csauper

Differential Revision: D64693773

fbshipit-source-id: a4cc949e9568641fdcacb3eebe9ddfdbb6864c35

Author: Vivek Miglani

.github/workflows/retry.yml

@@ -0,0 +1,19 @@
+name: Retry Test
+on:
+  workflow_dispatch:
+    inputs:
+      run_id:
+        required: true
+jobs:
+  rerun-on-failure:
+    permissions: write-all
+    runs-on: ubuntu-latest
+    steps:
+      - name: rerun ${{ inputs.run_id }}
+        env:
+          GH_REPO: ${{ github.repository }}
+          GH_TOKEN: ${{ github.token }}
+          GH_DEBUG: api
+        run: |
+          gh run watch ${{ inputs.run_id }} > /dev/null 2>&1
+          gh run rerun ${{ inputs.run_id }} --failed