set TFLITE_ELIXIR_PREFER_PRECOMPILED to NO in precompile ci workflow

Author: cocoa-xu

.github/workflows/linux-precompile.yml

@@ -8,8 +8,10 @@ on:
       - 'precompile-test-linux'
 
 jobs:
-  mix_test:
+  precompile:
     runs-on: ubuntu-20.04
+    env:
+      TFLITE_ELIXIR_PREFER_PRECOMPILED: NO
     strategy:
       fail-fast: false
       matrix:

.github/workflows/macos-precompile.yml

@@ -8,10 +8,11 @@ on:
       - 'precompile-test-macos'
 
 jobs:
-  mix_test:
+  precompile:
     runs-on: macos-11
     env:
       MIX_ENV: dev
+      TFLITE_ELIXIR_PREFER_PRECOMPILED: NO
 
     strategy:
       fail-fast: false