chore: Add github action to automatically label epic tasks (#168)

.github/workflows/label-epic-task.yml

@@ -0,0 +1,45 @@
+name: Label Child Issues
+
+on:
+  issues:
+    types: [opened, edited]
+
+jobs:
+  label_child_issues:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fetch Linked Issues
+        id: get_linked_issues
+        run: |
+          linked_issues=$(curl -s -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+            -H "Accept: application/vnd.github.v3+json" \
+            https://api.github.com/repos/${{ github.repository }}/issues/${{ github.event.issue.number }}/timeline \
+            | jq -r '.[] | select(.event == "cross-referenced") | .source.issue.number')
+
+          echo "Linked Issues: $linked_issues"
+
+          # Assuming there's only one linked parent issue
+          echo "PARENT_ISSUE=$(echo $linked_issues | head -n 1)" >> $GITHUB_ENV
+
+      - name: Get Labels from Parent Issue
+        id: get_labels
+        if: env.PARENT_ISSUE
+        run: |
+          labels=$(curl -s -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+            -H "Accept: application/vnd.github.v3+json" \
+            https://api.github.com/repos/${{ github.repository }}/issues/${PARENT_ISSUE} \
+            | jq -r '.labels[] | select(.name != "epic") | .name')
+
+          # Add the epic-task label to the list
+          labels="$labels\nepic-task"
+
+          # Escape newlines for GitHub environment variable handling
+          formatted_labels="${labels//$'\n'/'%0A'}"
+          echo "LABELS=$formatted_labels" >> $GITHUB_ENV
+
+      - name: Apply Labels to Child Issue
+        if: env.PARENT_ISSUE
+        uses: actions-ecosystem/action-add-labels@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: ${{ env.LABELS }}