Use Docker edge tag for commits in main, even untagged

.github/workflows/ci.yml

@@ -43,11 +43,12 @@ jobs:
         images: |
           willbereplaced
         tags: |
+          type=edge,branch=main
           type=semver,pattern={{version}}
           type=semver,pattern={{major}}.{{minor}}
 
     - name: Build and release
-      if: startsWith(github.ref, 'refs/tags/') && success()
+      if: (github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/')) && success()
       env:
         # get tags from the json object and pass as a string-encoded list
         tags: "${{ toJSON(fromJSON(steps.meta.outputs.json).tags) }}"