docs: update readme

ci: update action version

.github/workflows/docker.yml

@@ -4,6 +4,8 @@ on:
   push:
     branches:
       - main
+    tags:
+      - '*'
 
 jobs:
   build-and-push:
@@ -36,7 +38,7 @@ jobs:
           images: ghcr.io/${{ github.repository }}
 
       - name: Build and push Docker image (multi-arch)
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Dockerfile

README.md

@@ -153,11 +153,14 @@ print(result.text_content)
 
 ### Docker
 
+We recommend you to use a specific tag, just as follow :
+
 ```sh
-docker build -t markitdown:latest .
-docker run --rm -i markitdown:latest < ~/your-file.pdf > output.md
+docker run --rm -i ghcr.io/microsoft/markitdown:v0.1.2 < ~/your-file.pdf > output.md
 ```
 
+It is nevertheless possible to use the `latest` or `main` tag.
+
 ## Contributing
 
 This project welcomes contributions and suggestions. Most contributions require you to agree to a