update CI to use new julia install

Author: jonwzheng

.github/workflows/CI.yml

@@ -102,9 +102,8 @@ jobs:
       - name: Install and link Julia dependencies
         timeout-minutes: 120 # this usually takes 20-45 minutes (or hangs for 6+ hours).
         run: |
-          python -c "import julia; julia.install(); import diffeqpy; diffeqpy.install()"
-          julia -e 'using Pkg; Pkg.add(PackageSpec(name="ReactionMechanismSimulator",rev="for_rmg")); using ReactionMechanismSimulator'
-
+          . RMG-Py/install_rms.sh
+          
       - name: Install Q2DTor
         run: echo "" | make q2dtor