tweak branch builder slack text

.github/workflows/branch-builder.yml

@@ -20,4 +20,4 @@ jobs:
         uses: ./
         with:
           channel: ${{ env.SLACK_CHANNEL_ID }}
-          text: "branch-builder message from `ynab/slack-post-message-action/${{ env.BRANCH_NAME }}`:\n\n*Testing!*\n\nhttps://www.ynab.com"
+          text: "Test message from <https://github.com/ynab/slack-post-message-action|`ynab/slack-post-message-action`>:\n\nMessage sent from: <https://github.com/ynab/slack-post-message-action/compare/main...${{ env.BRANCH_NAME }}|`${{ env.BRANCH_NAME }}`>\nWorkflow Log: <https://github.com/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID|$GITHUB_RUN_ID>"