Use github context instead of env.

Author: TechGuard

.github/workflows/build.yml

@@ -31,7 +31,7 @@ jobs:
       run: npm run build --if-present
       if: (!startsWith(github.ref, 'refs/tags/v'))
       env:
-        OVERRIDE_VERSION: ${{ format('#{0}-dev', env.GITHUB_RUN_NUMBER) }}
+        OVERRIDE_VERSION: ${{ format('#{0}-dev', github.run_number) }}
 
     - name: Build App (Release)
       run: npm run build --if-present
@@ -56,7 +56,7 @@ jobs:
       uses: allenevans/set-env@v1.0.0
       if: (!startsWith(github.ref, 'refs/tags/v'))
       with:
-        RELEASE_VERSION: ${{ format('#{0}-dev', env.GITHUB_RUN_NUMBER) }}
+        RELEASE_VERSION: ${{ format('#{0}-dev', github.run_number) }}
         TARGET_BRANCH: 'gh-pages'
         TARGET_PATH: 'app/dev'