Add secrets to build workflow

Included environment variables for `PUBLISH_TOKEN`, `CERTIFICATE_CHAIN`, `PRIVATE_KEY`, and `PRIVATE_KEY_PASSWORD` in the build workflow.

.github/workflows/build.yml

@@ -62,6 +62,11 @@ jobs:
 
       # Set environment variables
       - name: Export Properties
+        env:
+          PUBLISH_TOKEN: ${{ secrets.PUBLISH_TOKEN }}
+          CERTIFICATE_CHAIN: ${{ secrets.CERTIFICATE_CHAIN }}
+          PRIVATE_KEY: ${{ secrets.PRIVATE_KEY }}
+          PRIVATE_KEY_PASSWORD: ${{ secrets.PRIVATE_KEY_PASSWORD }}
         id: properties
         shell: bash
         run: |