chore: automatically pre-release beta

Author: Thomas Nordquist

.github/workflows/platform-builds.yml

@@ -48,6 +48,7 @@ jobs:
       - run: yarn package ${{ matrix.build.task }}
         if: steps.semantic.outputs.new_release_published == 'true'
         env:
+          EP_PRE_RELEASE: 'true'
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SNAPCRAFT_STORE_CREDENTIALS: ${{ secrets.SNAPCRAFT_STORE_CREDENTIALS }}