workflows: fix repository name in summary

github.event is empty in case of sceduled workflows.
Repository name should be fetched through github.repository variable instead.

.github/workflows/summary.yml

@@ -1,6 +1,7 @@
 name: Notify owners with a summary about open issues and PRs
 
 on:
+  workflow_dispatch:
   schedule:
   - cron: "0 7 * * 1"
 
@@ -24,11 +25,13 @@ jobs:
           gh issue list --json title,updatedAt,labels,assignees,url --template \
             '{{ printf "URL\tTitle\tLast updated\n"}}{{range .}}{{printf "%s\t%s\t%s\n" .url .title (timeago .updatedAt)}}{{end}}' | column -ts $'\t' >> $GITHUB_ENV
           echo 'EOF' >> $GITHUB_ENV
+
+          # Fetch repository name and store it to
+          # REPOSITORY_NAME environment variable
+          echo "REPOSITORY_NAME=$(echo '${{ github.repository }}' | awk -F '/' '{print $2}')" >> $GITHUB_ENV
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          OWNER: ${{ github.repository_owner }}
-          REPO: ${{ github.event.repository.name }}
       - name: notify
         run: |
           # Send open PRs and issues lists from corresponding environment variables to a dedicated webhook URL
-          curl -d '{ "repo": "${{ github.event.repository.name }}", "prs": "${{ env.PRS_CONTENT }}", "issues": "${{ env.ISSUES_CONTENT }}" }' ${{ secrets.SUMMARY_WEBHOOK_URL }}
+          curl -d '{ "repo": "${{ env.REPOSITORY_NAME }}", "prs": "${{ env.PRS_CONTENT }}", "issues": "${{ env.ISSUES_CONTENT }}" }' ${{ secrets.SUMMARY_WEBHOOK_URL }}