fix(docker): Use buildx for publication builds (#154)

* fix(docker): Use buildx for publication builds

Signed-off-by: Kleo Davidson <[email protected]>

* chore: add PR validation without publishing

Signed-off-by: Kleo Davidson <[email protected]>

---------

Signed-off-by: Kleo Davidson <[email protected]>

Author: davidsow

.github/workflows/publish-image.yaml

@@ -9,6 +9,7 @@ on:
         description: "Tag to publish in addition to `latest`"
         required: true
         type: string
+  pull_request:
 
 jobs:
   publish:
@@ -17,6 +18,14 @@ jobs:
     steps:
       - uses: actions/[email protected]
 
+      - name: Setup Buildx
+        uses: docker/[email protected]
+        with:
+          install: true
+          platforms: |
+            linux/amd64
+            linux/arm64
+
       - name: Compute Tags
         id: compute-tags
         run: |
@@ -44,7 +53,7 @@ jobs:
         uses: docker/[email protected]
         with:
           context: .
-          push: true
+          push: ${{ github.event_name != 'pull_request' }} # allows dry-run validation on PR
           tags: ${{ steps.compute-tags.outputs.tags }}
           platforms: |
             linux/amd64