build: disable macos build cache for now

.github/workflows/build_slim_packages.yaml

@@ -53,7 +53,7 @@ jobs:
     strategy:
       matrix:
         erl_otp:
-        - 23.2.7.2
+        - 23.2.7.2-emqx-2
 
     steps:
     - uses: actions/checkout@v1
@@ -73,15 +73,16 @@ jobs:
         brew install curl zip unzip gnu-sed kerl unixodbc freetds
         echo "/usr/local/bin" >> $GITHUB_PATH
         git config --global credential.helper store
-    - uses: actions/cache@v2
-      id: cache
-      with:
-        path: ~/.kerl
-        key: erl${{ matrix.erl_otp }}-macos10.15
+    # - uses: actions/cache@v2
+    #   id: cache
+    #   with:
+    #     path: ~/.kerl
+    #     key: erl${{ matrix.erl_otp }}-macos10.15
     - name: build erlang
-      if: steps.cache.outputs.cache-hit != 'true'
+      # if: steps.cache.outputs.cache-hit != 'true'
       timeout-minutes: 60
       run: |
+        export OTP_GITHUB_URL="https://github.com/emqx/otp"
         kerl build ${{ matrix.erl_otp }}
         kerl install ${{ matrix.erl_otp }} $HOME/.kerl/${{ matrix.erl_otp }}
     - name: build