ci(publish): only run on manual workflow, remove tag check

Signed-off-by: Ewan Harris <ewan.harris@okta.com>

.github/workflows/publish.yml

@@ -1,9 +1,6 @@
 name: Publish Release
 
 on:
-  pull_request:
-    types:
-      - closed
   workflow_dispatch:
 
 ### TODO: Replace instances of './.github/actions/' with reference to the `dx-sdk-actions` repo is made public and this file is transferred over
@@ -47,17 +44,6 @@ jobs:
           repo_owner: ${{ github.repository_owner }}
           repo_name: ${{ github.event.repository.name }}
 
-      # Check if the tag already exists
-      - id: tag_exists
-        uses: ./.github/actions/tag-exists
-        with:
-          tag: ${{ steps.get_version.outputs.version }}
-          token: ${{ secrets.GITHUB_TOKEN }}
-
-      # If the tag already exists, exit with an error
-      - if: steps.tag_exists.outputs.exists == 'true'
-        run: exit 1
-
       # Create a release for the tag
       - uses: ./.github/actions/release-create
         with: