Add the skeleton for the hackday discussions workflow.

.github/workflows/discussions.yml

@@ -0,0 +1,46 @@
+name: Generate Discussion Thread for Hackdays
+
+on:
+  workflow_dispatch:
+
+jobs:
+  create-discussion-threads:
+    runs-on: ubuntu-latest
+    permissions:
+      discussions: write
+      contents: read
+
+    steps:
+
+      - name: Generate the Hackathon title
+        run: |
+          DATE=$(date --iso-8601 | sed 's|-|/|g')
+          echo "DISCUSSION_TITLE=Hackathon $DATE" >> $GITHUB_ENV
+
+      - name: Set the Hackathon description
+        run: |
+          echo "DISCUSSION_BODY=Reporting out on earthaccess hack days. Use the 'comment' button at the very bottom to send a message. Additionally, consider sending issues and PRs relevant to your work to help make the job of future readers easier. It is okay to duplicate information here! Use the reply feature to have a discussion under any comment. Enjoy!" >> $GITHUB_ENV
+          
+
+      - name: Create Discussions
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} 
+          REPOSITORY_ID: ""
+          CATEGORY_ID: ""
+        run: |
+         gh api graphql -f query="
+         mutation 
+          {createDiscussion
+            (
+              input: 
+                {
+                repositoryId: ${{ env.REPOSITORY_ID }}, 
+                categoryId: ${{ env.CATEGORY_ID }}, 
+                body: \"${{ env.DISCUSSION_BODY }}\", 
+                title: \"${{ env.DISCUSSION_TITLE }}\"
+                }
+            ) 
+            {
+              discussion {id}
+            }
+          }"