cache otp with arch as well

Author: warmwaffles

.github/workflows/macos-precompile.yml

@@ -32,7 +32,7 @@ jobs:
         id: cache-otp
         with:
           path: ./cache/otp
-          key: ${{ runner.os }}-otp-${{ matrix.otp_version }}
+          key: ${{ runner.os }}-otp-${{ matrix.arch }}-${{ matrix.job.otp }}
 
       - name: Install OTP
         run: |
@@ -46,7 +46,7 @@ jobs:
         uses: actions/cache@v3
         with:
           path: ./cache/elixir
-          key: ${{ runner.os }}-elixir-${{ matrix.job.elixir }}-${{ matrix.job.otp }}
+          key: ${{ runner.os }}-elixir-${{ matrix.arch }}-${{ matrix.job.elixir }}-${{ matrix.job.otp }}
 
       - name: Download and Compile Elixir
         if: steps.cache-elixir.outputs.cache-hit != 'true'