update tag finding logic

Signed-off-by: omrishiv <[email protected]>

.github/workflows/nightly.yaml

@@ -43,13 +43,13 @@ jobs:
         # find previous tag by filtering out nightly tags and choosing the
         # second to last tag (last one is the current release)
         run: |
-          prev_tag=$(git tag | grep -v "nightly" | sort -r --version-sort | head -n 2 | tail -n 1)
-          echo "PREVIOUS_TAG=$prev_tag" >> $GITHUB_ENV
+          prev_tag=$(git tag | grep "nightly" | sort -r --version-sort | head -n 2 | tail -n 1)
+          echo "PREVIOUS_NIGHTLY_TAG=$prev_tag" >> $GITHUB_ENV
       - name: 'Clean up nightly releases'
         uses: actions/github-script@v4
         with:
           github-token: ${{ steps.generate-token.outputs.token }}
           script: |
             const { owner, repo } = context.repo
-            const { data: { id } } = await github.repos.getReleaseByTag({ owner, repo, ${{ env.PREVIOUS_TAG }} })
+            const { data: { id } } = await github.repos.getReleaseByTag({ owner, repo, ${{ env.PREVIOUS_NIGHTLY_TAG }} })
             await github.repos.deleteRelease({ owner, repo, release_id: id })