Append cache key directly to env.

action.yml

@@ -31,7 +31,7 @@ runs:
 
     - name: Create Cache Key
       run: |
-        ${{ github.action_path }}/create_cache_key.sh "${{ inputs.version }})" ${{ inputs.packages }} >> $GITHUB_ENV
+        ${{ github.action_path }}/create_cache_key.sh "${{ inputs.version }})" ${{ inputs.packages }}
       shell: bash
 
     - name: Load Package Cache

create_cache_key.sh

@@ -18,4 +18,4 @@ echo "* Value to hash is '$value'."
 key=$(echo $value | md5sum | /bin/cut -f1 -d' ')
 echo "* Value hashed as '$key'."
 
-echo "CACHE_KEY=$key"
+echo "CACHE_KEY=$key" >> $GITHUB_ENV