Merge pull request #59 from rapidsai/jakirkham/add_gha_upload_stub

Add GHA workflow stub for uploading packages

.github/workflows/upload.yml

@@ -0,0 +1,24 @@
+name: Upload conda packages
+on:
+  workflow_run:
+    workflows:
+      - Build conda package
+    types:
+      - completed
+
+jobs:
+  on-success:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.workflow_run.conclusion == "success" }}
+    steps:
+      - run: |
+          echo "Build passing"
+          exit 0
+
+  on-failure:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.workflow_run.conclusion == "failure" }}
+    steps:
+      - run: |
+          echo "Build failing"
+          exit 1