Add Apple M support to wordcount extractor (#115)

Author: lmarini

.github/workflows/docker.yaml

@@ -37,7 +37,7 @@ jobs:
         include:
           - name: wordcount
             FOLDER: sample-extractors/wordcount
-            PLATFORM: "linux/amd64"
+            PLATFORM: "linux/amd64,linux/arm64"
     steps:
       - uses: actions/checkout@v2