ci: Fix URL to actions by using a variable (#27)

## Description

<!-- A summary of what this pull request achieves and a rough list of
changes. -->

## Breaking Changes

<!-- Optional, if there are any breaking changes document them,
including how to migrate older code. -->

## Notes & open questions

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## Change checklist

- [x] Self-review.
- [x] Documentation updates following the [style
guide](https://rust-lang.github.io/rfcs/1574-more-api-documentation-conventions.html#appendix-a-full-conventions-text),
if relevant.
- [x] Tests if relevant.
- [x] All breaking changes documented.

Author: flub

.github/workflows/beta.yaml

@@ -38,6 +38,6 @@ jobs:
           severity: error
           details: |
             Rustc beta tests failed in **${{ github.repository }}**
-            See https://github.com/n0-computer/${{ github.repository }}/actions/workflows/beta.yaml
+            See https://github.com/${{ github.repository }}/actions/workflows/beta.yaml
           webhookUrl: ${{ secrets.DISCORD_N0_GITHUB_CHANNEL_WEBHOOK_URL }}
 

.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