ci: Updated the trigger for the release job (#176)

* ci: Updated release job

* ci: Updated release trigger

Author: frgfm

.github/workflows/release.yml

@@ -6,6 +6,7 @@ on:
 
 jobs:
   pypi-publish:
+    if: "!github.event.release.prerelease"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -55,6 +56,7 @@ jobs:
           python -c "import torchcam; print(torchcam.__version__)"
 
   conda-publish:
+    if: "!github.event.release.prerelease"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2