ci: Post correct link to discord about flaky failures. (#83)

## Description

Previously it linked to iroh's flaky.yaml actions.

This updates it to link to the iroh-blobs repository.

## Change checklist

- [x] Self-review.

---------

Co-authored-by: Floris Bruynooghe <flub@n0.computer>

Author: matheus23

.github/workflows/flaky.yaml

@@ -87,7 +87,7 @@ jobs:
             echo "$failure" >> $GITHUB_OUTPUT
           done
           echo "" >> $GITHUB_OUTPUT
-          echo "See https://github.com/n0-computer/iroh/actions/workflows/flaky.yaml" >> $GITHUB_OUTPUT
+          echo "See https://github.com/${{ github.repository }}/actions/workflows/flaky.yaml" >> $GITHUB_OUTPUT
           echo "$EOF" >> $GITHUB_OUTPUT
       - name: Notify discord on failure
         uses: n0-computer/discord-webhook-notify@v1