Fix github repo url resolution in release discord message

Author: rabelenda-abstracta

.github/workflows/release.yml

@@ -90,4 +90,4 @@ jobs:
           DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
         uses: Ilshidur/action-discord@master
         with:
-          args: 'A new release is out! Check it at ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/releases/tag/v${{ inputs.version }}.'
+          args: 'A new release is out! Check it at ${{ env.GITHUB_SERVER_URL }}/${{ env.GITHUB_REPOSITORY }}/releases/tag/v${{ inputs.version }}'