Add missing docker volume

Author: Ben Sullivan

action.yml

@@ -29,4 +29,4 @@ runs:
         BH_API_KEY: ${{ inputs.securestack_api_key }}
         BH_APP_ID: ${{ inputs.securestack_app_id }}
         BH_SEVERITY: ${{ inputs.severity }}
-      run: docker run -e BH_API_KEY -e BH_APP_ID -e BH_SEVERITY -v "/home/runner/work/actions-code/actions-code":"/github/workspace" securestackau/bloodhound-cli code -t ${{ inputs.language }} ${{ inputs.flags }}; echo $?
+      run: docker run -e BH_API_KEY -e BH_APP_ID -e BH_SEVERITY -v $GITHUB_WORKSPACE:/github/workspace securestackau/bloodhound-cli code -t ${{ inputs.language }} ${{ inputs.flags }}; echo $?