Merge pull request #60 from lightstep/add-prebuilt-images-for-arrow-c…

…ollector

Add latest tag for master branch

.github/workflows/publish-image.yml

@@ -33,7 +33,10 @@ jobs:
         id: meta
         uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
         with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-EXPERIMENTAL
+          tags: |
+            # set latest tag for master branch
+            type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', 'main') }}
       # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
       # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
       # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.