Remove RPC variable

Author: febo

.github/workflows/build-programs.yml

@@ -64,7 +64,6 @@ jobs:
         working-directory: configs/scripts/program
         run: ./build.sh
         env:
-          RPC: ${{ secrets.MAINNET_RPC }}
           PROGRAMS: ${{ env.PROGRAMS }}
 
       - name: Upload program builds